This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Oral Cavity, Subject name: Surgery
Supra omohyoid dissection is one variety of 
Select and explain. 
A. Selective neck dissection, B. Modified radical neck dissection, C. Radical neck dissection, D. Posterolateral dissection
A: Selective neck dissection
Answer: A: Selective neck dissection 
Explanation: 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.