This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Upper Extremity, Subject name: Anatomy
[{'content': 'Trapezius is supplied by- \nSelect and explain. \nA. Spinal Accessory nerve, B. Greater occipital nerve, C. Thoracodorsal nerve, D. Dorsal Scapular nerve', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Spinal Accessory nerve * Spinal accessory (spinal part) nerve supplies motor branches to# Trapezius# Sternocleidomastoid", 'role': 'assistant'}]