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: Surgery
[{'content': 'Commando’s operation is for \nSelect and explain. \nA. Radical mastectomy, B. Oral cancer, C. Mandible, D. Leg amputation', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]