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
A patient was staed on antihypeensive medications; developed renal failure, the drug offended is - 
Select and explain. 
A. Beta-blocker, B. Alpha-blocker, C. Calcium channel blocker, D. ACE inhibitor
D: ACE inhibitor
Answer: D: ACE inhibitor 
Explanation: Ans. is 'd' i.e., ACE inhibitors o ACE inhibitors and angiotensin receptor antagonists can cause acute renal failure in patients with bilateral renal aery stenosis, stenosis of the aery to a single remaining kidney, hea failure, or volume depletion owing to diarrhea or diuretics.