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: Pharmacology
Which of the following class of drugs is contraindicated in bilateral renal artery stenosis? 
Select and explain. 
A. Angiotensin receptor blocker, B. ACE inhibitors, C. Aldosterone antagonist, D. Renin inhibitor
B: ACE inhibitors
Answer: B: ACE inhibitors 
Explanation: Ans. is 'b' i.e., ACE inhibitors Contraindications of ACE inhibitors* Pregnancy* Renal artery stenosis (whether unilateral, bilateral renal or suspected from the presence of generalized atherosclerosis) - ACE inhibitor may cause renal failure.