<prompt> Supra omohyoid dissection is one variety ofSelective neck dissectionModified radical neck dissectionRadical neck dissectionPosterolateral dissection  <response>: Ans. a Selective neck dissectionRef: Bailey- 26th edition Page 720 Supraomohyoid neck dissection involves removal of neck nodes at level 1,2,3. It is done for No neck node palpable cases and for some cases of N1. Extended Omohyoid Neck dissection removes - Level 1,2,3 and 4 nodes. 