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
Structures preserved in modified radical neck dissection are all except: 
Select and explain. 
A. Accessory nerve, B. Sternocleidomastoid muscle, C. Submandibular gland, D. Internal jugular vein
C: Submandibular gland
Answer: C: Submandibular gland 
Explanation: None