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: Surgery
[{'content': 'Painful arc syndrome is caused by impingement of ? \nSelect and explain. \nA. Sub acromial bursa, B. Sub deltoid bursa, C. Rotator cuff tendon, D. Biceps tendon', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Rotator cuff tendon Painful arc syndrome Pain in the shoulder and upper arm during mid range of glenohumeral abduction. Causes - supraspinatus tendon tear or tendinitis, subacromial bursitis, fracture of greater tuberosity. The space between the upper end of humerus and the acromion gets compromised so that during mid abduction the tendon of rotator cuff gets nipped between the greater tuberosity and acromion.", 'role': 'assistant'}]