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': 'Cranial part of accessory nerve supplies \nSelect and explain. \nA. Sternocleidomastoid, B. Trapezius, C. Levator scapulae, D. Levator palatini', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Sternocleidomastoid and trapezius develop from branchial arch mesoderm and are supplied by spinal part of accessory nerve.\xa0\nLevator scapulae are supplied by a branch from dorsal scapular nerve and branches from C3, C4.', 'role': 'assistant'}]