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
The rate limiting step in the biosynthesis of cholesterol is catalyzed by: 
Select and explain. 
A. HMG CoA lyase, B. Acetyl CoA carboxylase, C. HMG CoA reductase, D. HMG CoA synthase
C: HMG CoA reductase
Answer: C: HMG CoA reductase 
Explanation: None