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
[{'content': 'Calcium channel blockers used in HTN are all except: \nSelect and explain. \nA. Amlodipine, B. Clevidipine, C. Captopril, D. Nifedipine', 'role': 'user'}, {'content': 'Answer: C \nExplanation: 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)', 'role': 'assistant'}]