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
Painful arc syndrome is caused by the tear of 
Select and explain. 
A. Deltoid, B. Supra spinatus, C. Trapezius, D. Pectoralis major
B: Supra spinatus
Answer: B: Supra spinatus 
Explanation: Painful arc syndrome is caused by tear of the supraspinatus tendon. Subacromial bursitis, fracture of greater tuberosity also may produce Ref: Gray's39e/p-793-795