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 35 year female comes with Size 5 cm tumour of the oral cavity + single lymph node of 2 cm diameter on the same side in the neck is staged as \nSelect and explain. \nA. T2NI MO, B. T3 NI MO, C. T2 N2 MO, D. TI NI MO', 'role': 'user'}, {'content': "Answer: B \nExplanation: TNM staging of oral cancer :\nTx : Cannot be assessed e.g. already excised.\nT0 : No evidence of primary tumor (occult primary).\nTis : Carcinoma in - situ.\nT1 : Equal to or less than 2 cm in greatest dimension.\nT2 : More than 2 cm. bul less than or equal to 4 cm.\nT3 : More than 4 cm.\nT4a : Moderately advanced local disease :\nLip and check - involvement of cortical bone, skin, inferior alveolar nerve.\nTongue - extrinsic muscles, skin.\nT4b : Very advanced local disease :\nCheck - involvement of masticatory space, base of skull, internal carotid artery.\nInternal carotid artery.\nTNM staging of cavity tumors. Status of lymph nodes 'N' :", 'role': 'assistant'}]