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: ENT
In the Nodal "N" staging of laryngeal carcinoma, extranodal invasion is indicated by 
Select and explain. 
A. N2C, B. N3A, C. N3B, D. N3C
C: N3B
Answer: C: N3B 
Explanation: None