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': 'The muscle which is resected in classical neck dissection is: \nSelect and explain. \nA. Sternohyoid, B. Stenrothyroid, C. Sterno mastoid, D. Sternocricoid', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]