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': 'A 80 year old patient presents with a midline tumor of the lower jaw, involving the alveolar margin. He is endentulous. Rx of choice is : \nSelect and explain. \nA. Hemimandibulectomy, B. Commando operation, C. Segmental mandiblectomy, D. Marginal mandibulectomy', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Segmented mandibulectomy The best t/t for such tumor is excision of the growth along with segmental mandibulectomy. Hemimandibulectomy would not be useful, as the tumor is midline. Since the bone is involved by the growth, marginal mandibulectomy would not be a good choice.", 'role': 'assistant'}]