This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anesthesia, Subject name: Pharmacology
[{'content': 'Which of the following drug releases Nitric oxide \nSelect and explain. \nA. Hydralazine, B. Aminophylline, C. Amrinone, D. Sildenaphil sulphate', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Hydralazine is used with or without other medications to treat high blood pressure. Lowering high blood pressure helps prevent strokes, hea attacks, and kidney problems.Hydralazine is called a vasodilator. It works by relaxing blood vessels so blood can flow through the body more easily. Hydralazine may induce aeriolar vasodilation by preventing oxidation of nitric oxide and thereby lowering blood pressure.', 'role': 'assistant'}]