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: Anatomy
Superficial incision on posterior triangle of neck leads the  - 
Select and explain. 
A. Difficulty in shrugging of shoulder, B. Difficulty in start of abduction, C. Difficulty in rotation of face towards the same side, D. Difficulty in flexion
A: Difficulty in shrugging of shoulder
Answer: A: Difficulty in shrugging of shoulder 
Explanation: Damage to spinal accessory nerve causes drooping of the shoulder, difficulty in overhead abduction and difficulty in shrugging of the shoulder due to paralysis of the trapezius.