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
[{'content': 'A 52 year old woman presented with weakness of shoulder movements. Investigations revealed quadrangular space syndrome. Which of the following nerve is likely to be affected ? \nSelect and explain. \nA. Brachial plexus, B. Axillary nerve, C. Median nerve, D. Radial nerve', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Quadrangular space is a passageway for the nerves and vessels between the axilla anteriorly and scapular region posteriorly. It&;s contents are Axillary nerve Posterior circumflex humeral aery and vein Quadrangular space syndrome is a condition caused by hyperophy or fibrosis of quadrangular space muscles which impinge on axillary nerve. Patient present with weakness of shoulder movements. Ref : Gray&;s Anatomy The Anatomical Basics of Clinical Practice 41 e pg 814.', 'role': 'assistant'}]