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': 'True about sternocleidomastoid are -a) It arises from sternum and clavicleb) Turns head to the opposite sidec) Shortened in congenital torticollisd) Supplied by the cranial accessory nervee) Supplied by occipital artery \nSelect and explain. \nA. bcde, B. abce, C. acde, D. abde', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Sternocleidomastoid arises by two heads : (i) Sternal head (from sternum), and (ii) clavicular head (from clavicle).\nContraction of one side of sternocleidomastoid causes : (i) Tilting (bending) of head on same side, and (ii) Turning (rotation) of face and head on opposite side, which can be appreciated as turning of chin to opposite side.\nCongenital shortening of sternocleidomastoid causes torticollis (wry neck).\nSternocleidomastoid is supplied by spinal part of accessory nerve (spinal accessory nerve), not by cranial part (cranial accessory).\nIt is supplied by superior thyroid, suprascapular, and occipital arteries.', 'role': 'assistant'}]