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
which does not include microsomal enzymes 
Select and explain. 
A. cimetidine, B. griseofulvin, C. rifampicin, D. phenobarbitone
A: cimetidine
Answer: A: cimetidine 
Explanation: Ref-KDT 6/e p27-28 cimetidine does not contain microsomal enzymes