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 patient with oral cancer, had ipsilateral lymph node measuring 2 cm, single in number with capsular spread. According to TNM staging it is included under: \nSelect and explain. \nA. Nx, B. N1, C. N2, D. N3', 'role': 'user'}, {'content': "Answer: D \nExplanation: Nx: Nodal status can't be assessed.\nNo: No lymph nodes.\nN1: Single ipsilateral lymph node <3 cm\nN2:\nA: Single ipsilater lymph 3.6 cm\nB: Multiple ipsilater lymph <6 cm\nC: Bilateral or contralateral lymph nodes <6 cm.\nN3:\nAny lymph node with >6 cm, or\nAny lymph node with capsular invasion.", 'role': 'assistant'}]