This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S, Subject name: Pharmacology
Drugs increasing renin levels except: 
Select and explain. 
A. Clonidine, B. Hydralazine, C. Nifedipine, D. Captopril
A: Clonidine
Answer: A: Clonidine 
Explanation: Ans. A. ClonidineRenin levels are increased when there is reflex sympathetic outflow. Vasodilators and ACE inhibitors results in reflex increase in renin activity. Clonidine on the other hand decrease the sympathetic outflow.