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 statements are true about 6–mercaptopurine EXCEPT: \nSelect and explain. \nA. It is metabolized by xanthine oxidase, B. It does not cause hyperuricemia, C. Its dose should be reduced when allopurinol is given  concurrently, D. It is an active metabolite of azathioprine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: All anticancer drugs can result in hyperuricemia by causing the destruction of excess cells.\nAzathioprine is an immunosuppressant drug that acts by generating 6-MP.\n6-MP is metabolized by xanthine oxidase. Its dose should be reduced when allopurinol is given concurrently.', 'role': 'assistant'}]