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': 'A patient on warfarin was given phenobarbitone, The result would have been - \nSelect and explain. \nA. Increase the dose of warfarin, B. Decrease the dose of warfarin, C. Increase the dose of phenobarbitone, D. Decerease the dose of phenobarbitone', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Increase the dose of warfarin", 'role': 'assistant'}]