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': 'All are functions of latissimus dorsi on shoulder, except : \nSelect and explain. \nA. External rotation of shoulder, B. Extension, C. Adduction, D. Medial rotation', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Latissimus dorsi originates from T7\xa0to T12 spines, thoracolumbar fascia, outer lip of iliac crest, lower 4 ribs and inferior angle of scapula to insert into the floor of bicipital groove. It is innervated by thoracodorsal nerve.\nIt is used as musculocutaneous flap to fill areas of tissue loss.\nAction :\n\nAdduction, extension and medial rotation of shoulder.', 'role': 'assistant'}]