<prompt> Which of the following is a vinodilator?HydralazineMinoxidilNitroprussideNifedipine  <response>: Ref:Katzung 10e p173-174;KDT 6e p540 Hydralazine, minoxidil and nifedipine are primarily aerioler dilators where as nitroprusside is a mixed aerioler and venous dilator, therefore best answer here seems to be nitroprusside 