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
Radical neck dissection involves removal of: 
Select and explain. 
A. Spinal accessory nerve, B. External juglar vein, C. Tail of parotid, D. All of the above
A: Spinal accessory nerve
Answer: A: Spinal accessory nerve 
Explanation: Cadical neck dissection involves removal of:

I - V Lymph nodes
Spinal accesory nerve
Internal juglar vein
Sternocleidomastoid.