This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pectoral Region, Axilla & Brachial Plexus, Subject name: Anatomy
[{'content': 'Posterior wall of axilla is formed by all EXCEPT: \nSelect and explain. \nA. Teres major, B. Subscapularis, C. Supraspinatus, D. Latissimus dorsi', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. (c) SupraspinatusRef: BDC 6th ed. vol. I/47; Gray's Anatomy, 39th ed/ 841 Boundaries of Axilla* ANTERIOR WALL: Pectoralis major, Pectoralis minor, Clavipectoral fascia* POSTERIOR WALL: Subscapularis, Teres major, Latissimus dorsi* MEDIAL WALL: first 4 ribs & their associated intercostals muscles, Serratus anterior* LATERAL WALL: Intertubercular (bicipital groove), Biceps tendon.", 'role': 'assistant'}]