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: Surgery
[{'content': 'Supra omohyoid dissection of lymph nodes is called as \nSelect and explain. \nA. Selective neck dissection, B. Modified radical neck dissection, C. Radical neck dissection, D. Functional neck dissection', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Supra omohyoid is removing level I to IV lymph nodes. It is a selective LN dissetion.', 'role': 'assistant'}]