This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Pharmacology
Which of the following is a vinodilator 
Select and explain. 
A. Hydralazine, B. Minoxidil, C. Nitroprusside, D. Nifedipine
C: Nitroprusside
Answer: C: Nitroprusside 
Explanation: 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