This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: JIPMER 2019, Subject name: Surgery
Shrugging of shoulder following neck surgery due to injury to:- 
Select and explain. 
A. Spinal accessory nerve, B. Thoracodorsal nerve, C. Bell's nerve, D. Vagus nerve
A: Spinal accessory nerve
Answer: A: Spinal accessory nerve 
Explanation: Shrugging of shoulder is because of trapezius muscle, supplied by spinal accessory nerve Radical neck dissection: - Removal of level I - V lymph nodes - Removal of spinal accessory nerve, internal jugular vein and sternocleidomastoid muscle