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: Pharmacology
Mechanism of action of statins: March 2013 
Select and explain. 
A. HMG-CoA synthase stimulator, B. HMG-CoA reductase stimulator, C. HMG-CoA synthase inhibitor, D. HMG-CoA reductase inhibitor
D: HMG-CoA reductase inhibitor
Answer: D: HMG-CoA reductase inhibitor 
Explanation: Ans. D i.e. HMG-CoA reductase inhibitor Statins used to lower cholesterol levels, acts by inhibiting the enzyme HMG-CoA reductase