1|Page
NBME CBSE REAL EXAM 2026-2027, 200 Complete
High-Yield Questions and Answers | Latest 2026
Complete Exam USMLE Step 1 | Medical
Examination
Exam (elaborations)
NBME CBSE REAL EXAM 2026
200 Complete High-Yield Questions and Answers with Detailed
Rationales
Latest 2026 Complete Exam | Already Graded A+
Course: Comprehensive Basic Science Examination (CBSE)
TABLE OF CONTENTS
Section Topic Area Questions
Section 1 Cardiovascular System 1-25
Section 2 Respiratory System 26-40
Section 3 Renal & Acid-Base 41-55
Section 4 Gastrointestinal System 56-70
Section 5 Endocrine System 71-85
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Section Topic Area Questions
Section 6 Reproductive System 86-95
Section 7 Neurology & Special Senses 96-115
Section 8 Musculoskeletal & Connective Tissue 116-130
Section 9 Hematology & Oncology 131-145
Section 10 Immunology & Rheumatology 146-155
Section 11 Infectious Diseases 156-170
Section 12 Biochemistry & Genetics 171-185
Section 13 Pharmacology 186-200
About This Study Guide
This comprehensive study guide contains 200 high-yield questions with
detailed rationales designed to simulate the NBME CBSE
(Comprehensive Basic Science Examination) format for the 2026
USMLE Step 1 testing cycle. Each question includes the correct answer,
a detailed evidence-based rationale, and clinical pearls to reinforce
understanding of foundational sciences.
Key Features:
• ✓ 200+ exam-style questions covering all major Step 1 topics
• ✓ Verified correct answers with detailed rationales
• ✓ High-yield content focused on frequently tested concepts
• ✓ Clinical correlations and pathophysiology focus
,3|Page
• ✓ Updated for 2026 with latest exam trends
• ✓ Perfect for CBSE, USMLE Step 1, and basic science
examination preparation
SECTION 1: CARDIOVASCULAR SYSTEM (Questions 1-25)
Question 1
A 65-year-old man with a history of hypertension presents with chest
pain that occurs with exertion and is relieved by rest. An ECG during an
episode of pain shows ST-segment depression. Which of the following is
the most likely diagnosis?
A. Unstable angina
B. Stable angina
C. Prinzmetal angina
D. Myocardial infarction
Answer: B. Stable angina
Rationale: Stable angina is characterized by chest pain that is
predictably triggered by exertion (increased myocardial oxygen demand)
and relieved by rest or nitroglycerin. ECG during pain typically shows
ST-segment depression due to subendocardial ischemia. Unstable angina
presents with a change in pattern, pain at rest, or decreasing exercise
tolerance. Prinzmetal angina is caused by coronary artery spasm and
presents with ST-segment elevation. Myocardial infarction presents with
prolonged, unrelieved pain and elevated cardiac enzymes .
, 4|Page
Clinical Pearl: The pathophysiology of stable angina involves fixed
atherosclerotic plaques that limit coronary blood flow during periods of
increased demand.
Question 2
A 55-year-old man with a history of hypertension and hyperlipidemia
presents with sudden onset of severe, tearing chest pain that radiates to
his back. His blood pressure is 160/90 mm Hg in the right arm and
110/70 mm Hg in the left arm. Chest x-ray shows a widened
mediastinum. Which of the following is the most likely diagnosis?
A. Myocardial infarction
B. Pulmonary embolism
C. Aortic dissection
D. Pericarditis
Answer: C. Aortic dissection
Rationale: Aortic dissection presents with sudden, severe, tearing chest
pain that often radiates to the back. Pulse deficits (blood pressure
differential between arms) and a widened mediastinum on chest x-ray
are highly suggestive. Risk factors include hypertension, connective
tissue disorders (Marfan syndrome), and bicuspid aortic valve.
Immediate CT angiography is required for diagnosis .
Clinical Pearl: Stanford type A dissections involve the ascending aorta
and require surgical repair; type B dissections involve the descending
aorta and are often managed medically.
Question 3
NBME CBSE REAL EXAM 2026-2027, 200 Complete
High-Yield Questions and Answers | Latest 2026
Complete Exam USMLE Step 1 | Medical
Examination
Exam (elaborations)
NBME CBSE REAL EXAM 2026
200 Complete High-Yield Questions and Answers with Detailed
Rationales
Latest 2026 Complete Exam | Already Graded A+
Course: Comprehensive Basic Science Examination (CBSE)
TABLE OF CONTENTS
Section Topic Area Questions
Section 1 Cardiovascular System 1-25
Section 2 Respiratory System 26-40
Section 3 Renal & Acid-Base 41-55
Section 4 Gastrointestinal System 56-70
Section 5 Endocrine System 71-85
,2|Page
Section Topic Area Questions
Section 6 Reproductive System 86-95
Section 7 Neurology & Special Senses 96-115
Section 8 Musculoskeletal & Connective Tissue 116-130
Section 9 Hematology & Oncology 131-145
Section 10 Immunology & Rheumatology 146-155
Section 11 Infectious Diseases 156-170
Section 12 Biochemistry & Genetics 171-185
Section 13 Pharmacology 186-200
About This Study Guide
This comprehensive study guide contains 200 high-yield questions with
detailed rationales designed to simulate the NBME CBSE
(Comprehensive Basic Science Examination) format for the 2026
USMLE Step 1 testing cycle. Each question includes the correct answer,
a detailed evidence-based rationale, and clinical pearls to reinforce
understanding of foundational sciences.
Key Features:
• ✓ 200+ exam-style questions covering all major Step 1 topics
• ✓ Verified correct answers with detailed rationales
• ✓ High-yield content focused on frequently tested concepts
• ✓ Clinical correlations and pathophysiology focus
,3|Page
• ✓ Updated for 2026 with latest exam trends
• ✓ Perfect for CBSE, USMLE Step 1, and basic science
examination preparation
SECTION 1: CARDIOVASCULAR SYSTEM (Questions 1-25)
Question 1
A 65-year-old man with a history of hypertension presents with chest
pain that occurs with exertion and is relieved by rest. An ECG during an
episode of pain shows ST-segment depression. Which of the following is
the most likely diagnosis?
A. Unstable angina
B. Stable angina
C. Prinzmetal angina
D. Myocardial infarction
Answer: B. Stable angina
Rationale: Stable angina is characterized by chest pain that is
predictably triggered by exertion (increased myocardial oxygen demand)
and relieved by rest or nitroglycerin. ECG during pain typically shows
ST-segment depression due to subendocardial ischemia. Unstable angina
presents with a change in pattern, pain at rest, or decreasing exercise
tolerance. Prinzmetal angina is caused by coronary artery spasm and
presents with ST-segment elevation. Myocardial infarction presents with
prolonged, unrelieved pain and elevated cardiac enzymes .
, 4|Page
Clinical Pearl: The pathophysiology of stable angina involves fixed
atherosclerotic plaques that limit coronary blood flow during periods of
increased demand.
Question 2
A 55-year-old man with a history of hypertension and hyperlipidemia
presents with sudden onset of severe, tearing chest pain that radiates to
his back. His blood pressure is 160/90 mm Hg in the right arm and
110/70 mm Hg in the left arm. Chest x-ray shows a widened
mediastinum. Which of the following is the most likely diagnosis?
A. Myocardial infarction
B. Pulmonary embolism
C. Aortic dissection
D. Pericarditis
Answer: C. Aortic dissection
Rationale: Aortic dissection presents with sudden, severe, tearing chest
pain that often radiates to the back. Pulse deficits (blood pressure
differential between arms) and a widened mediastinum on chest x-ray
are highly suggestive. Risk factors include hypertension, connective
tissue disorders (Marfan syndrome), and bicuspid aortic valve.
Immediate CT angiography is required for diagnosis .
Clinical Pearl: Stanford type A dissections involve the ascending aorta
and require surgical repair; type B dissections involve the descending
aorta and are often managed medically.
Question 3
