This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pharmacokinetics, Subject name: Pharmacology
Which of the following drugs is an inducer of microsomal enzymes? 
Select and explain. 
A. Erythromycin, B. Isoniazid, C. Ketoconazole, D. Rifampicin
D: Rifampicin
Answer: D: Rifampicin 
Explanation: Enzyme Inducers G Griseofulvin P Phenytoin R Rifampicin S Smoking Cell Carbamazepine Phone Phenobarbitone Rifampicin induces the following cytochrome enzymes: CYP3A4 CYP1A2 CYP2C9 CYP2C19