This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
[{'content': 'Alkylating agents are :  a) Vincristine b) Actinomycin–D  c) Chlorambucil d) 5–Fluorouracil e) Cyclophosphamide \nSelect and explain. \nA. ab, B. ad, C. ae, D. ce', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]