This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous (Neoplasia), Subject name: Surgery
[{'content': 'In TNM staging, N= ? \nSelect and explain. \nA. Nature of tumor, B. Number of tumors, C. Number of lymph nodes, D. Metastasis', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. (c) Number of lymph nodes', 'role': 'assistant'}]