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
The muscle which is resected in classical neck dissection is: 
Select and explain. 
A. Sternohyoid, B. Stenrothyroid, C. Sterno mastoid, D. Sternocricoid
C: Sterno mastoid
Answer: C: Sterno mastoid 
Explanation: None