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: ENT
A 80-year-old patient present with a midline tumor of the lower jaw, involving the alveolar margin. He is edentulous. Treatment of choice: 
Select and explain. 
A. Hemimandibulectomy, B. Commando operation, C. Segmental mandibulectomy, D. Marginal mandibulectomy
C: Segmental mandibulectomy
Answer: C: Segmental mandibulectomy 
Explanation: Surgery is the treatment of choice in mandible cancers. Radiotherapy is contraindicated as it can lead to osteoradionecrosis of mandible. Mandible is managed surgically by marginal or segmental resection. Marginal (rim) resection keeps the outer/lower rim (1 cm thick mandible) intact to maintain cosmesis. It is indicated when there is involvement of periosteum only or with minimal alveolar/coical involvement. Segmental resection removes a full segment of mandible creating a defect which necessitates reconstruction.