This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Other topics and Adverse effects, Subject name: Anatomy
All of the following statements are true about 6 mercapto purine except 
Select and explain. 
A. 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
B: It does not cause hyperuricemia
Answer: B: It does not cause hyperuricemia 
Explanation: Ref-KDT 6/e p823,824 All anticancer drugs can result in hyperuricemia by causing the detruction of excess cells. Azathioprine is an inmunosuppressant drug that acts by generating 6-MP 6-MP is metabolized by xanthine oxidase. Its dose should be reduced when allopurinol is given concurrently.