This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Oral cavity, Subject name: Surgery
[{'content': 'The commando operation is:- \nSelect and explain. \nA. Abdominoperineal resection of the rectum for carcinoma, B. Disaiculation of the hip for gas gangrene of the leg, C. Extended radical mastectomy, D. Excision of carcinoma of the jaw and lymph nodes', 'role': 'user'}, {'content': "Answer: D \nExplanation: Commando's operation: Total glossectomy hemimandibulectomy + Removal of floor of mouth + Radical lymph node dissection Indicated when carcinoma is fixed to mandible with infiltration of floor of mouth.", 'role': 'assistant'}]