<prompt> All the following drugs cause aeriolar dilatation exceptHydralazineDiazoxideNifedipineGlyceryl trinitrate  <response>: Nitrates are primary venodilators. Nefidipine is a calcium channel blocker and aeriolar dilator.Fenoldopam , minoxidil also cause vasodilationRef: KD Tripathi; 6th ed, pg 540 