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': 'Protractor of scapula \nSelect and explain. \nA. Serratus anterior, B. Rhomboidis major, C. Deltoid, D. Pectoralis major', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Protraction of the scapula (as in pushing and punching movements). It is brought about by the serratus anterior and by the pectoralis minor. It is associated with forward movements of the lateral end and backward movement of the medial end of the clavicle . Ref - BDC 6th e p142', 'role': 'assistant'}]