This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
In essential hypertension the drug prescribed with least cardiovascular effect - 
Select and explain. 
A. Clonidine, B. Alpha blocker, C. Beta blocker, D. ACE inhibitor
D: ACE inhibitor
Answer: D: ACE inhibitor 
Explanation: None