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 edentulous. Rx of choice is: \nSelect and explain. \nA. Hemi mandibulectomy, B. Commando operation, C. Segmental mandiblectomy, D. Marginal mandibulectomy', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Segmental mandibulectomy recommended for alveolar lesions, tumors adherent to the mandible, or for radiographic evidence of bone involvement. Ref: Craniomaxillofacial Reconstructive and Corrective Bone Surgery: Principles of Internal Fixation By Alex M. Greenberg, Joachim Prein, 2002, page 411.', 'role': 'assistant'}]