This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Upper limb, Subject name: Anatomy
[{'content': 'Nerve supply of Trapezius \nSelect and explain. \nA. Spinal accessory nerve, B. Hypoglossal nerve, C. Trochlear nerve, D. Trigeminal nerve', 'role': 'user'}, {'content': "Answer: A \nExplanation: TRAPEZIUS: Origin: medial 1/3 rd of superior nuchal line., ligamentum nuchae, external occipital protuberance and spines of C7-T12 veebrae. Inseion:-lateral 1/3rd of clavicle., medial margin of acromion,superior margin of spine of scapula. Nerve supply: spinal accessory( motor),C3,C4 spinal nerves ( proprioceptive). Action:- upper fibres elevate scapula,'middle fibres retract ,and lower fibres depress scapula. {Reference: vishram singh, pg no. 72}", 'role': 'assistant'}]