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: Pathology
[{'content': 'A patient is diagnosed with cancer. Size of the lesion is found to be 5 cm in diameter\xa0and metastasis is found with single\xa0ipsilateral lymph node. The stage according to TNM staging is: \nSelect and explain. \nA. Stage 1, B. Stage 2, C. Stage 3, D. Stage 4', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Without T4 → N1 always gives stage III only, with T4,N1 gives stage IV. N2 /N3 always gives stage IV.\nT3 implies Tumor >4 cm.', 'role': 'assistant'}]