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
All of the following structures forms the boundaries of the quadrangular space which is present under the deltoid muscle in the shoulder region, from the posterior side, EXCEPT: 
Select and explain. 
A. Teres minor, B. Teres major, C. Surgical neck of humerus, D. Long head of biceps brachii
D: Long head of biceps brachii
Answer: D: Long head of biceps brachii 
Explanation: Structures forming the boundaries of the quadrangular space from the posterior side are:Superiorly by teres minorInferiorly by teres majorLaterally by surgical neck of humerusMedially by long head of triceps brachiiContents of the quadrangular space are:Axillary nervePosterior circumflex humeral vesselsSagging pa of shoulder joint capsuleRef: Clinical Anatomy: (a Problem Solving Approach) By Kulkarni page 110.