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: Biochemistry
Which of the following enzymes is common to the synthesis of cholesterol and ketone bodies: 
Select and explain. 
A. HMG -Co-A Reductase, B. HMG-Co-A Lyase, C. HMG-Co-A Synthase, D. Thiokinase
C: HMG-Co-A Synthase
Answer: C: HMG-Co-A Synthase 
Explanation: C i.e. HMG-Co-A Synthase