Tick the drug, inhibiting viral DNA synthesis:

Correct Answer: D

Rationale: The correct answer is D: Acyclovir. Acyclovir is a nucleoside analogue that inhibits viral DNA synthesis by acting as a chain terminator when incorporated into the viral DNA. Interferon (A) boosts the immune response, Saquinavir (B) inhibits HIV protease, and Amantadine (C) blocks viral entry. Therefore, only Acyclovir directly targets viral DNA synthesis.

Correct Answer: A

Rationale: The correct answer is A: Isosorbide mononitrate and nifedipine. Isosorbide mononitrate dilates coronary arteries, reducing myocardial oxygen demand. Nifedipine is a calcium channel blocker that helps reduce cardiac workload. Together, they can help manage symptoms of hypertrophic cardiomyopathy. Choice B (Nitroglycerin and captopril) is incorrect because captopril is an ACE inhibitor used for heart failure, not hypertrophic cardiomyopathy. Choice C (Nitroglycerin and verapamil) is incorrect because verapamil can worsen symptoms due to its negative inotropic effects. Choice D (Verapamil and metoprolol) is incorrect because metoprolol is a beta-blocker, which can worsen symptoms in hypertrophic cardiomyopathy by reducing heart rate and contractility.

Correct Answer: B

Rationale: Failed to generate a rationale of 500+ characters after 5 retries.

Correct Answer: A

Rationale: Failed to generate a rationale of 500+ characters after 5 retries.

Correct Answer: D

Rationale: Failed to generate a rationale of 500+ characters after 5 retries.