<prompt> N3 in Head Neck cancer TNM staging refers toIpsilateral lymph node 3-6 cmContralateral lymph node 3-6 cmBilateral lymph nodes 3-6 cmContralateral lymph node 6 cm  <response>: Answer- D. Contralateral lymph node 6 cmN3- Metastasis in a lymph node 6 cm in greatest dimension 