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
The drug which releases NO 
Select and explain. 
A. Hydralazine, B. Aminophylline, C. Amrinone, D. Sildenaphil
A: Hydralazine
Answer: A: Hydralazine 
Explanation: Ans.is'a'i.e.,HydralazineRef:GoodmanGilmanlTthlep'863, 249, 825NO donors, which release NO are used to elicit smooth muscle relaxation.Eg: Organic nitrates (nitroglycerine), Organic nitrites (Isoamylnitrite), Sodium nitroprusside, Nebivolol & Hydralazine