This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Back, Deltoid, and Scapular Region, Subject name: Anatomy
Most common injured MUSCLE in rotator cuff is : 
Select and explain. 
A. Supraspinatous muscle, B. Infraspinatous muscle, C. Teres minor, D. Subscapularis
A: Supraspinatous muscle
Answer: A: Supraspinatous muscle 
Explanation: Ans. (a) Supraspinatous muscleRef : BDC 6th ed. vol. 1 / 68-69* Four of the Intrinsic shoulder muscles collectively forms the Rotator cuff muscles. They are supraspinatus, infraspinatus, teres minor, and subscapularis (referred to as the SITS muscles). They are also called rotator cuff muscles because they form a musculotendinous rotator cuff around the gleno-humeral joint.* Injury or disease may damage the musculotendinous rotator cuff, producing instability of the glenohumeral joint. Trauma may tear or rupture one or more of the tendons of the SITS muscles; that of the supraspinatus is most commonly involved.