CORONARY ARTERY DISEASE (CAD) QUESTIONS
AND ANSWERS WITH RATIONALES/GRADED
A+/2026 UPDATE/100% CORRECT
SECTION 1: PATHOPHYSIOLOGY & RISK FACTORS
1. The primary underlying cause of coronary artery disease is:
• A) Vasospasm of the coronary arteries
• B) Atherosclerosis, a progressive inflammatory disease characterized by
plaque formation within the arterial wall
• C) Congenital anomalies of the coronary arteries
• D) Embolism from a distant source
Correct Answer: B
Rationale: Atherosclerosis is the primary pathologic process underlying CAD. It
involves the accumulation of lipids, inflammatory cells (macrophages, T-
lymphocytes), smooth muscle cells, and extracellular matrix within the intima of
the coronary arteries, forming plaques that narrow the lumen and can rupture,
leading to acute coronary syndromes.
2. The earliest detectable lesion of atherosclerosis is the:
• A) Fibrous plaque
• B) Fatty streak
• C) Complicated plaque
• D) Calcified plaque
,Correct Answer: B
Rationale: The fatty streak is the earliest visible lesion in atherogenesis, consisting
of lipid-laden macrophages (foam cells) within the intima. It is present in children
and young adults. It is not necessarily a direct precursor to advanced plaques but
represents the initial inflammatory response to endothelial injury.
3. Which of the following is the most important modifiable risk factor for
coronary artery disease?
• A) Family history
• B) Age
• C) Tobacco smoking
• D) Male gender
Correct Answer: C
Rationale: Tobacco smoking is a major modifiable risk factor for CAD. It promotes
endothelial dysfunction, inflammation, thrombosis, and oxidative stress. Smoking
cessation reduces cardiovascular risk significantly. Age, family history, and male
gender are non-modifiable risk factors.
4. The "classic" triad of risk factors for coronary artery disease includes:
• A) Hypertension, diabetes, and obesity
• B) Hyperlipidemia, hypertension, and smoking
• C) Sedentary lifestyle, stress, and alcohol use
• D) Family history, age, and male gender
Correct Answer: B
Rationale: The classic major modifiable risk factors are hyperlipidemia (especially
elevated LDL-C), hypertension, and tobacco smoking. Diabetes, obesity, and
,sedentary lifestyle are also major risk factors. The management of these factors is
the cornerstone of primary and secondary prevention of CAD.
5. Which lipoprotein is most directly associated with an increased risk of
atherosclerotic cardiovascular disease?
• A) High-density lipoprotein (HDL)
• B) Low-density lipoprotein (LDL)
• C) Very-low-density lipoprotein (VLDL)
• D) Chylomicrons
Correct Answer: B
Rationale: LDL cholesterol (LDL-C) is the primary atherogenic lipoprotein. It
delivers cholesterol to the arterial wall, where it can be oxidized and taken up by
macrophages to form foam cells, initiating the atherosclerotic process. Lowering
LDL-C is the primary target of lipid-lowering therapy.
6. Which of the following is a non-modifiable risk factor for CAD?
• A) Hypertension
• B) Diabetes mellitus
• C) Advancing age
• D) Hyperlipidemia
Correct Answer: C
Rationale: Advancing age is a non-modifiable risk factor. The risk of CAD increases
with age due to cumulative exposure to risk factors and age-related vascular
changes. Hypertension, diabetes, and hyperlipidemia are modifiable risk factors
that can be treated or controlled.
, 7. The metabolic syndrome is a cluster of risk factors that increases the risk of
CAD. It is defined by the presence of at least three of which of the following?
• A) Hypertension, hyperglycemia, central obesity, dyslipidemia (low HDL,
high triglycerides)
• B) Hyperlipidemia, smoking, age > 50
• C) Family history, male gender, high LDL
• D) Sedentary lifestyle, stress, high BMI
Correct Answer: A
*Rationale: Metabolic syndrome is diagnosed when a patient has at least three of
the following: abdominal obesity (waist circumference ≥ 102 cm in men, ≥ 88 cm
in women), elevated triglycerides (≥ 150 mg/dL), reduced HDL-C (< 40 mg/dL in
men, < 50 mg/dL in women), elevated blood pressure (≥ 130/85 mmHg), and
elevated fasting glucose (≥ 100 mg/dL). This cluster markedly increases CVD risk.*
8. The role of inflammation in atherosclerosis is supported by which of the
following?
• A) Elevated C-reactive protein (CRP) levels are associated with increased
cardiovascular risk
• B) CRP is a direct cause of atherosclerosis
• C) Inflammation only occurs at the end stage of plaque formation
• D) Anti-inflammatory drugs have no role in CAD
Correct Answer: A
Rationale: High-sensitivity CRP (hs-CRP) is a marker of systemic inflammation and
is independently associated with increased cardiovascular risk. It is not a direct
cause but reflects the inflammatory activity within plaques. Anti-inflammatory
therapies like colchicine have been shown to reduce cardiovascular events in some
studies.
AND ANSWERS WITH RATIONALES/GRADED
A+/2026 UPDATE/100% CORRECT
SECTION 1: PATHOPHYSIOLOGY & RISK FACTORS
1. The primary underlying cause of coronary artery disease is:
• A) Vasospasm of the coronary arteries
• B) Atherosclerosis, a progressive inflammatory disease characterized by
plaque formation within the arterial wall
• C) Congenital anomalies of the coronary arteries
• D) Embolism from a distant source
Correct Answer: B
Rationale: Atherosclerosis is the primary pathologic process underlying CAD. It
involves the accumulation of lipids, inflammatory cells (macrophages, T-
lymphocytes), smooth muscle cells, and extracellular matrix within the intima of
the coronary arteries, forming plaques that narrow the lumen and can rupture,
leading to acute coronary syndromes.
2. The earliest detectable lesion of atherosclerosis is the:
• A) Fibrous plaque
• B) Fatty streak
• C) Complicated plaque
• D) Calcified plaque
,Correct Answer: B
Rationale: The fatty streak is the earliest visible lesion in atherogenesis, consisting
of lipid-laden macrophages (foam cells) within the intima. It is present in children
and young adults. It is not necessarily a direct precursor to advanced plaques but
represents the initial inflammatory response to endothelial injury.
3. Which of the following is the most important modifiable risk factor for
coronary artery disease?
• A) Family history
• B) Age
• C) Tobacco smoking
• D) Male gender
Correct Answer: C
Rationale: Tobacco smoking is a major modifiable risk factor for CAD. It promotes
endothelial dysfunction, inflammation, thrombosis, and oxidative stress. Smoking
cessation reduces cardiovascular risk significantly. Age, family history, and male
gender are non-modifiable risk factors.
4. The "classic" triad of risk factors for coronary artery disease includes:
• A) Hypertension, diabetes, and obesity
• B) Hyperlipidemia, hypertension, and smoking
• C) Sedentary lifestyle, stress, and alcohol use
• D) Family history, age, and male gender
Correct Answer: B
Rationale: The classic major modifiable risk factors are hyperlipidemia (especially
elevated LDL-C), hypertension, and tobacco smoking. Diabetes, obesity, and
,sedentary lifestyle are also major risk factors. The management of these factors is
the cornerstone of primary and secondary prevention of CAD.
5. Which lipoprotein is most directly associated with an increased risk of
atherosclerotic cardiovascular disease?
• A) High-density lipoprotein (HDL)
• B) Low-density lipoprotein (LDL)
• C) Very-low-density lipoprotein (VLDL)
• D) Chylomicrons
Correct Answer: B
Rationale: LDL cholesterol (LDL-C) is the primary atherogenic lipoprotein. It
delivers cholesterol to the arterial wall, where it can be oxidized and taken up by
macrophages to form foam cells, initiating the atherosclerotic process. Lowering
LDL-C is the primary target of lipid-lowering therapy.
6. Which of the following is a non-modifiable risk factor for CAD?
• A) Hypertension
• B) Diabetes mellitus
• C) Advancing age
• D) Hyperlipidemia
Correct Answer: C
Rationale: Advancing age is a non-modifiable risk factor. The risk of CAD increases
with age due to cumulative exposure to risk factors and age-related vascular
changes. Hypertension, diabetes, and hyperlipidemia are modifiable risk factors
that can be treated or controlled.
, 7. The metabolic syndrome is a cluster of risk factors that increases the risk of
CAD. It is defined by the presence of at least three of which of the following?
• A) Hypertension, hyperglycemia, central obesity, dyslipidemia (low HDL,
high triglycerides)
• B) Hyperlipidemia, smoking, age > 50
• C) Family history, male gender, high LDL
• D) Sedentary lifestyle, stress, high BMI
Correct Answer: A
*Rationale: Metabolic syndrome is diagnosed when a patient has at least three of
the following: abdominal obesity (waist circumference ≥ 102 cm in men, ≥ 88 cm
in women), elevated triglycerides (≥ 150 mg/dL), reduced HDL-C (< 40 mg/dL in
men, < 50 mg/dL in women), elevated blood pressure (≥ 130/85 mmHg), and
elevated fasting glucose (≥ 100 mg/dL). This cluster markedly increases CVD risk.*
8. The role of inflammation in atherosclerosis is supported by which of the
following?
• A) Elevated C-reactive protein (CRP) levels are associated with increased
cardiovascular risk
• B) CRP is a direct cause of atherosclerosis
• C) Inflammation only occurs at the end stage of plaque formation
• D) Anti-inflammatory drugs have no role in CAD
Correct Answer: A
Rationale: High-sensitivity CRP (hs-CRP) is a marker of systemic inflammation and
is independently associated with increased cardiovascular risk. It is not a direct
cause but reflects the inflammatory activity within plaques. Anti-inflammatory
therapies like colchicine have been shown to reduce cardiovascular events in some
studies.
