This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cytotoxic Anticancer Drugs, Subject name: Pharmacology
[{'content': 'All of the following are examples of alkylating agents except:- \nSelect and explain. \nA. Procarbazine, B. Melphalan, C. Busulfan, D. Bleomycin', 'role': 'user'}, {'content': 'Answer: D \nExplanation: ALKYLATING AGENTS If: Ifosfamide Bus: Busulfan Not: Nitrosoureas Present: Procarbazine Take: Temozolomide My: Melphalan Cycle: Cyclophosphamide', 'role': 'assistant'}]