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': 'Which muscle causes retraction of scapula? \nSelect and explain. \nA. Serratus anterior, B. Levator scapulae, C. Rhomboideus major, D. Supraspinatus', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The rhomboid major muscle originates from the spines of T2-T5 and supraspinous ligaments and inses into the medial border of scapula. Its action is retraction of scapula. BD chaurasia 7th edition, page 65-table 5.2', 'role': 'assistant'}]