This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Neck, Subject name: Surgery
In extended supraomohyoid neck dissection, lymph Node dissection is done up to: 
Select and explain. 
A. II, B. III, C. IV, D. V
C: IV
Answer: C: IV 
Explanation: Selective Neck Dissection - Supraomohyoid neck dissection: Removal of level I-III LNs - Extended supraomohyoid neck dissection: Removal of level I-IV LNs - Posterolateral Neck Dissection: Removal of level II-V LNs + suboccipital LNs + retro auricular LNs - Lateral neck dissection: removal of level II-V LNs + Internal jugular vein - Central compament neck dissection: Removal of level VI LNs