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
[{'content': 'Superficial incision on posterior triangle of neck leads the  - \nSelect and explain. \nA. 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', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 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.', 'role': 'assistant'}]