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
[{'content': 'Most common microsomal enzyme involved in metabolism of xenobiotics is \nSelect and explain. \nA. CYP 3A4, B. CYP 1A2, C. CYP 2A6, D. CYP 2B6', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ref Goodman and Gilman 12th/129 CYP 3A4 is involved in metabolism of xenobiotics', 'role': 'assistant'}]