This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
Most common microsomal enzyme involved in metabolism of xenobiotics is 
Select and explain. 
A. CYP 3A4, B. CYP 1A2, C. CYP 2A6, D. CYP 2B6
A: CYP 3A4
Answer: A: CYP 3A4 
Explanation: Ref Goodman and Gilman 12th/129 CYP 3A4 is involved in metabolism of xenobiotics