Which of the following medications is most likely to cause a dry cough as a side effect?

A. Hydrochlorothiazide: This thiazide diuretic is primarily associated with electrolyte imbalances and increased urination. It does not commonly cause a dry cough. B. Aspirin: Aspirin is a nonsteroidal anti-inflammatory drug (NSAID) that can cause gastrointestinal irritation, bleeding, or hypersensitivity reactions, but a dry cough is not a typical side effect. C. Ramipril: ACE inhibitors like ramipril are well known to cause a persistent dry cough due to accumulation of bradykinin in the respiratory tract. This is a common adverse effect and often leads to discontinuation of the medication. D. Metoprolol: As a beta-blocker, metoprolol can cause bradycardia, hypotension, or fatigue, but it rarely causes a cough. It is not associated with the respiratory side effects seen with ACE inhibitors.