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
In TNM staging, N= ? 
Select and explain. 
A. Nature of tumor, B. Number of tumors, C. Number of lymph nodes, D. Metastasis
C: Number of lymph nodes
Answer: C: Number of lymph nodes 
Explanation: Ans. (c) Number of lymph nodes