This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S, Subject name: Medicine
[{'content': 'Drug used in hea failure- \nSelect and explain. \nA. ACE inhibitors, B. Hydralazine, C. Ca2+channel blockers, D. Carvedilol', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ref : harrisons-manual-of-medicine-16th-edition pg no: 36 HEA FAILURE This is a major predictor of perioperative risk.Regimenof ACE inhibitor and diuretics should be optimized preoperatively to minimizerisk of either pulmonary congestion or intravascular volume depletionpostoperatively. Ref Davidson 23rd edition pg 456', 'role': 'assistant'}]