This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Pharmacology
[{'content': 'Which of the following is Venodilator \nSelect and explain. \nA. Hydralizine, B. Minoxidil, C. Nitroprusside, D. Nifedipine', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Hydralizine, minoxidil and nifedipine are primarily aeriolar dilator whereas nitroprusside is a mixed aerial and venous dilator. Therefore best answer seems to be is a nitroprusside Refer kDT 6/e p540', 'role': 'assistant'}]