This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Head and neck, Subject name: Surgery
[{'content': "Commando's operation is for \nSelect and explain. \nA. Mandible, B. Radical mastectomy, C. Leg amputation, D. Oral cancer", 'role': 'user'}, {'content': 'Answer: D \nExplanation: It is en-bloc removal ,which includes wide excision of primary tumour with hemimandibulectomy and neck block dissection,examples : it is done usually in carcinoma of tongue or floor of the mouth ;it is a composite resection of primary tumour ,mandible and radical neck dissection(RND) SRB,5th,451.', 'role': 'assistant'}]