In rheumatic heart disease, only CMI is important:

Correct Answer: B

Rationale: Both cellular immunity (CMI) and humoral immunity (antibodies) contribute to rheumatic heart disease.

Correct Answer: A

Rationale: ACE inhibitors are first-line for both hypertension and heart failure.

Correct Answer: C

Rationale: Beta-blockers can mask hypoglycemia symptoms in diabetics.

Correct Answer: C

Rationale: The coronary sinus collects deoxygenated blood from the myocardium and empties it into the right atrium.

Correct Answer: C

Rationale: Tetralogy of Fallot includes VSD, pulmonary stenosis, overriding aorta, and RV hypertrophy. Patent foramen ovale is not a cardinal feature, though it may occur separately.