This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Upper Extremity, Subject name: Anatomy
[{'content': 'Flexion, adduction and medial rotation of arm is done by which muscle? \nSelect and explain. \nA. Pectoralis minor, B. Pectoralis major, C. Subclavius, D. Serratus Anterior', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B Pectoralis majorAnatomy of pectoralis major muscle:* Origin: Clavicle, sternum and costal cartilage 2nd - 6th ribs* Insertion: Lateral lip of intertubercular groove of humerus* Function: Flexion, adduction and medial rotation of arm', 'role': 'assistant'}]