This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Autonomic nervous system, Subject name: Pharmacology
[{'content': 'All the following drugs cause aeriolar dilatation except \nSelect and explain. \nA. Hydralazine, B. Diazoxide, C. Nifedipine, D. Glyceryl trinitrate', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Nitrates are primary venodilators. Nefidipine is a calcium channel blocker and aeriolar dilator.Fenoldopam , minoxidil also cause vasodilationRef: KD Tripathi; 6th ed, pg 540', 'role': 'assistant'}]