This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anti-Cancer, Subject name: Pharmacology
[{'content': 'All are alkylating agent except: \nSelect and explain. \nA. Busulfan, B. Melphalan, C. Cladribine, D. Cyclophosphamide', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. C. CladribineAlkylating agents are cyclophosphamide, ifosfamide, busulfan melphalan, carmustine, lomustine. cladribine is antimetabolite.', 'role': 'assistant'}]