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
[{'content': 'All of the following increases effect of warfarin except- \nSelect and explain. \nA. Cimetidine, B. Disulfiram, C. Cotrimoxazole, D. Griseofulvin', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is ' d ' i.e., Griseofulvin", 'role': 'assistant'}]