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
[{'content': 'Structure passes through upper triangular space: \nSelect and explain. \nA. Profunda brachii, B. Anterior circumflex humeral aery, C. Posterior circumflex humeral aery, D. Circumflex scapular aery', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Upper Quadrangular spaceIt has the following boundaries:- the teres major inferiorly- the long head of the triceps laterallyFor the superior border, some sources list the teres minor, while others list the subscapularis.It contains the scapular circumflex vessels.', 'role': 'assistant'}]