This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Upper limb bones and muscles (proximal region) & Scapular movements, Subject name: Anatomy
[{'content': 'Flexion, adduction and medial rotation of arm is done by which muscle \nSelect and explain. \nA. Serratus Anterior, B. Pectoralis major, C. Pectoralis minor, D. Subclavius', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Muscle Action Pectoralis major Adducts and medial rotation of arm Pectoralis minor Stabilizes the scapula Subclavius anchors and depresses the scapula Serratus Anterior protracts the scapula laterally rotates the scapula overhead abduction', 'role': 'assistant'}]