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
[{'content': 'Supra - amohyoid neck dissection is \nSelect and explain. \nA. 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', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]