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
[{'content': 'The drug which releases NO \nSelect and explain. \nA. Hydralazine, B. Aminophylline, C. Amrinone, D. Sildenaphil', 'role': 'user'}, {'content': "Answer: A \nExplanation: 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", 'role': 'assistant'}]