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': 'Aspirin is contraindicated in a patient who in on treatment with : \nSelect and explain. \nA. Prednisolone, B. Warfarin, C. Theophyline, D. Oral contraceptives', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]