Questions And Correct Answers (Verified
Answers) Plus Rationales 2025/2026 Q&A |
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1.
A 45-year-old man presents with severe chest pain radiating to his left arm. His
EKG shows ST-segment elevation in leads II, III, and aVF. Which coronary artery is
most likely occluded?
• A. Left anterior descending
• B. Left circumflex
• C. Right coronary artery
• D. Left main coronary
Inferior wall MI (II, III, aVF) is most commonly due to RCA occlusion.
2.
A 28-year-old woman presents with fatigue and conjunctival pallor. Labs show Hb
8 g/dL, MCV 72 fL, ferritin low. What is the most likely diagnosis?
• A. Vitamin B12 deficiency
• B. Iron deficiency anemia
• C. Anemia of chronic disease
• D. Sideroblastic anemia
Microcytic anemia with low ferritin is classic for iron deficiency.
,3.
A 60-year-old man with chronic alcohol use presents with confusion, ataxia, and
ophthalmoplegia. Which vitamin deficiency is responsible?
• A. Vitamin B6
• B. Vitamin C
• C. Thiamine (B1)
• D. Niacin
Wernicke’s encephalopathy is due to thiamine deficiency.
4.
A newborn has continuous machinery-like heart murmur. Which congenital heart
lesion is suspected?
• A. Patent ductus arteriosus
• B. Atrial septal defect
• C. Ventricular septal defect
• D. Coarctation of the aorta
PDA causes continuous “machine-like” murmur.
5.
A 34-year-old man presents with watery diarrhea after camping trip. Stool shows
flagellated trophozoites. What is the most likely organism?
• A. Giardia lamblia
• B. Entamoeba histolytica
• C. Cryptosporidium
, • D. Salmonella
Giardia causes foul-smelling watery diarrhea after contaminated water exposure.
6.
A 70-year-old man presents with resting tremor, rigidity, and bradykinesia. What
neurotransmitter is decreased in his brain?
• A. Dopamine
• B. Acetylcholine
• C. GABA
• D. Glutamate
Parkinson’s disease is due to loss of dopaminergic neurons in substantia nigra.
7.
A 25-year-old woman presents with a painless thyroid nodule. Fine needle
aspiration shows empty-appearing nuclei (“Orphan Annie eyes”). What is the
most likely diagnosis?
• A. Papillary thyroid carcinoma
• B. Follicular carcinoma
• C. Medullary carcinoma
• D. Anaplastic carcinoma
Papillary carcinoma shows “Orphan Annie eyes” and psammoma bodies.
8.
A patient has severe hypotension after starting an ACE inhibitor. Which condition
predisposes to this?
• A. Bilateral renal artery stenosis