<prompt> Patient with head and neck cancer with contralateral Lymphnode of 3 cm size. NstagingN2aN2bN2cN3  <response>: N0No nodal metastasis N1SingleIpsilateralEqual to or 3 cmN2aSingleIpsilateral3 to 6 cmN2bMultipleIpsilateralNone 6 cmN2cSingle or MultipleBilateral or ContralateralNone 6 cmN3Single or MultipleIpsilateral, Bilateral or ContralateralAny node 6 cm 