Which of the following is a vinodilator: (A) Hydralazine, (B) Minoxidil, (C) Nitroprusside, (D) Nifedipine
Answer is C. Ref-Katzung 10/e p173-174 Hydralazine, minoxidil and nifedipinen are primary aeriolar dilators whereas nitroprusside is a mixed Aeriolar and Venous delator therefore best answer here seems to be nitroprusside