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
Drug used in hea failure- 
Select and explain. 
A. ACE inhibitors, B. Hydralazine, C. Ca2+channel blockers, D. Carvedilol
A: ACE inhibitors
Answer: A: ACE inhibitors 
Explanation: 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