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 include : a) Doxorubicin b) Chlorambucil c) Vinblastine d) Busulfan e) Methotrexate \nSelect and explain. \nA. ace, B. bd, C. bc, D. ad', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]