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: Pharmacology
Which does not induce microsomal enzymes? 
Select and explain. 
A. Cimetidine, B. Griseofulvin, C. Rifampicin, D. Phenobarbitone
A: Cimetidine
Answer: A: Cimetidine 
Explanation: - Among the given options, only Cimetidine is a microsomal enzyme inhibitor.