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
All the following drugs cause aeriolar dilatation except 
Select and explain. 
A. Hydralazine, B. Diazoxide, C. Nifedipine, D. Glyceryl trinitrate
D: Glyceryl trinitrate
Answer: D: Glyceryl trinitrate 
Explanation: Nitrates are primary venodilators. Nefidipine is a calcium channel blocker and aeriolar dilator.Fenoldopam , minoxidil also cause vasodilationRef: KD Tripathi; 6th ed, pg 540