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
'N3' in Head & Neck cancer TNM staging refers to 
Select and explain. 
A. Ipsilateral lymph node 3-6 cm, B. Contralateral lymph node 3-6 cm, C. Bilateral lymph nodes 3-6 cm, D. Contralateral lymph node > 6 cm
D: Contralateral lymph node > 6 cm
Answer: D: Contralateral lymph node > 6 cm 
Explanation: Answer- D. Contralateral lymph node > 6 cmN3- Metastasis in a lymph node > 6 cm in greatest dimension