This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Sedative-Hypnotics and Parkinsonism, Subject name: Pharmacology
[{'content': 'A patient of DVT was stabilized on warfarin. This person was given phenobarbitone. Which of the following is the likely interaction between the two drugs? \nSelect and explain. \nA. Phenobarbitone increases the absorption of warfarin, B. Phenobarbitone increases the metabolism of warfarin, C. Phenobarbitone displaces warfarin from plasma protein binding sites, D. All of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: -- Barbiturates like phenobarbitone are powerful enzyme inducers -- These increase the metabolism of warfarin and decrease its anticoagulant effect.', 'role': 'assistant'}]