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
All of the following increases effect of warfarin except- 
Select and explain. 
A. Cimetidine, B. Disulfiram, C. Cotrimoxazole, D. Griseofulvin
D: Griseofulvin
Answer: D: Griseofulvin 
Explanation: Ans. is ' d ' i.e., Griseofulvin