This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Head and neck, Subject name: Surgery
[{'content': 'A patient presents with cheek ca of 2.5 cm size close to and involving the alveolus with a single mobile cervical lymph node of 6 cm size. What is the TNM staging \nSelect and explain. \nA. T3 N2, B. T3 N3, C. T4 N2, D. T4 N3', 'role': 'user'}, {'content': "Answer: D \nExplanation: TNM staging given in image Carcinoma Buccal Mucosa (Cheek) MC site of carcinoma oral cavity in India : Bucccal Mucosa. Related to chewing a combination of tobacco mixed with betel leaves, are a nut and lime shell Most malignant tumors are low grade SCC Frequently appearing on background of leukolakia. Lymphatic spread is first to Level I and II LNs Clinical features Pain is minimal, obstruction of stenson's duct can lead to parotid Enlargement Treatments T1: Excision with primary closure T2: Surgery +- Radiotherapy T3 and T4 surgery + Radiotherapy or chemoradiation Ref: Bailey and love 27th edition Pgno :772", 'role': 'assistant'}]