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': 'Drug contra-Indicated in bilateral renal aery stenosis \nSelect and explain. \nA. Propanolol, B. Guanethidine, C. Captopril, D. Amlodipine', 'role': 'user'}, {'content': 'Answer: C \nExplanation: ACE inhibitors are contraindicated in patients with renal aery stenosis as they can cause renal failure in them. Especially in bilaterl renal aery stenosis Unilateral renal aery stenosis- ACI in usage depends on clinical correlation All the other drugs are safe in renal aery stenosis. Ref: KD tripathi 8th ed. Page no 130', 'role': 'assistant'}]