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: Unknown
Which of the following enzymes is involved in process of both cholesterol and ketone bodies synthesis is – 
Select and explain. 
A. HMG CoA reductase, B. HMG CoA synthase, C. HMG CoA lyase, D. Thiolase
B: HMG CoA synthase
Answer: B: HMG CoA synthase 
Explanation: This enzyme is involved in both cholesterol synthesis as well as in ketone body synthesis.
HMG CoA reductase is the rate limiting enzyme of the cholesterol synthesis
HMG CoA lyase is the enzyme involved in ketone body synthesis .
Thiolases also known as acetyl-Coenzyme A acetyltransferases (ACAT) are enzymes which converts two units of acetyl-CoA to acetoacetyl CoA in the mevalonate pathway.
Thiolases are ubiquitous enzymes that have key roles in many vital biochemical pathways, including the beta oxidation pathway of fatty acid degradation and various biosynthetic pathways