This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pathology
All of the following are inducers of the microsomal enzyme system except? 
Select and explain. 
A. Carbamazepine, B. Phenytoin, C. Phenobarbitone, D. Ticlopidine
D: Ticlopidine
Answer: D: Ticlopidine 
Explanation: .