This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
[{'content': 'Drug contraindicated in bilateral renal artery stenosis is: \nSelect and explain. \nA. Propranolol, B. Guanethidine, C. Captopril, D. Amlodipine', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]