This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Pharmacology
Calcium channel blockers used in HTN are all except: 
Select and explain. 
A. Amlodipine, B. Clevidipine, C. Captopril, D. Nifedipine
C: Captopril
Answer: C: Captopril 
Explanation: Captopril is an ACE inhibitor- prototype ACE inhibitor all others mentioned in options are calcium channel blockers- all are dihydropyridines (Ref- Essentials of medical pharmacology K D TRIPATHI 8th Edition)