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
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 : 
Select and explain. 
A. Hemi-mandibulectomy, B. Commando operation, C. Segmental mandiblectomy, D. Marginal mandibulectomy
C: Segmental mandiblectomy
Answer: C: Segmental mandiblectomy 
Explanation: segmental mandibulectomy *Since it is a midline lesion involving the lower jaw treatment is segmental resection of mandible. *Marginal mandibulectomy is not indicated if alveolar margins involved grossly or radiologically. *Hemi-mandibulectomy is not recommended for midline lesion. Note: Segmental resection of anterior arch of mandible result in significant functional and cosmetic deformity called Andy Gump deformity. Immediate reconstruction done with osetomyocutaneous flap or free icrovascular bone graft.