In the treatment of hypertension, a patient is prescribed captopril, a medication known to affect the renin-angiotensin system. Is captopril considered a reversible or irreversible inhibitor of angiotensin-converting enzyme (ACE)?

• A. aptopril is a reversible inhibitor of ACE.
• B. aptopril is an irreversible inhibitor of ACE.
• C. Captopril does not inhibit ACE but instead blocks angiotensin II receptors.
• D. Captopril is both a reversible and irreversible inhibitor of ACE, depending on its concentration.

Answer: (A)