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
[{'content': 'All are arteriolar dilators except - \nSelect and explain. \nA. Hydralazine, B. Minoxidil, C. Nitrates, D. Nifedipine', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Nitrates", 'role': 'assistant'}]