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
Which of the following immunosuppressants is not used for the treatment of cancers? 
Select and explain. 
A. Cyclophosphamide, B. Cyclosporine, C. Methotrexate, D. 6-Mercaptopurine
B: Cyclosporine
Answer: B: Cyclosporine 
Explanation: (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.