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: Pharmacology
[{'content': 'Which of the following immunosuppressants is not used for the treatment of cancers? \nSelect and explain. \nA. Cyclophosphamide, B. Cyclosporine, C. Methotrexate, D. 6-Mercaptopurine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: (Ref: KDT 6/e p839, 840) All antimetabolites can be used as anticancer drugs except azathioprine. Cyclosporine acts by inhibiting the transcription of IL-2 gene. It has no anti-cancer propey.', 'role': 'assistant'}]