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: ENT
[{'content': 'Treatment of stage III carcinoma of oral tongue is: \nSelect and explain. \nA. Wide excision, B. Wide excision with supraomohyoid neck dissection, C. Wide excision with supraomohyoid neck dissection and post-operative radiotherapy, D. Radiotherapy delivering 7000 cGy', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Stage III carcinoma tongue means tumour more than 4 cm in greatest dimension with no neck nodes or tumour of T1 (<2cm),T2 (2-4cm)orT3 (>4cm) with a single ipsilateral node >3cm.Treatment will include wide excision of primary tumour with neck dissection and post-operative radiotherapy.All patients with stage III or stage IV carcinoma require post-operative radiotherapy in addition to surgery as this improves locoregional control of disease.', 'role': 'assistant'}]