This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: ENT
Supra - amohyoid neck dissection is 
Select and explain. 
A. Lymph nodes I - V levels removed, B. Lymph nodes I - III levels removed, C. Lymph nodes I - V level removed along with IJV, SCM and spinal accessory nerve, D. Lymph nodes I - III levels removed along with IJV SCM and spinal accessory nerve
B: Lymph nodes I - III levels removed
Answer: B: Lymph nodes I - III levels removed 
Explanation: None