<prompt> Enzyme common to cholesterol synthesis and ketone body synthesis:HMG CoA ReductaseHMG CoA SynthaseBeta hydroxy butyrate DehydrogenaseThiophorase  <response>: Enzymes common to cholesterol synthesis ketone body synthesis are HMG CoA Synthase Thiolase. HMG CoA Synthase Option 2 is rate limiting step in Ketone Body synthesis. HMG CoA Reductase Option 1 is rate limiting step in cholesterol synthesis. Beta hydroxy butyrate Dehydrogenase Option 3 is only used in ketone body synthesis. Thiophorase Option 4 is the first enzyme in ketone body utilization. First two steps of Cholesterol Synthesis are same as Ketone Body Synthesis but Cholesterol Synthesis occurs in Cytoplasm whereas Ketone Body Synthesis occurs in Mitochondria. 