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: Orthopaedics
[{'content': 'Most common muscle damaged in rotator cuff- \nSelect and explain. \nA. Supraspinatus, B. Infraspinatus, C. Subscapularis, D. Teres minor', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The tendons of the rotator cuff, not the muscle, are most commonly involved and of the four, the supraspinatus is affected most frequently as it passes below the acromion.', 'role': 'assistant'}]