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': 'Coracoacromial ligament resists which movements? \nSelect and explain. \nA. Upward displacement of humeral head, B. Abduction of shoulder, C. Inferior displacement of humerus, D. External rotation', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Upward displacement of humeral head * The coracoacromial ligament is a flat triangular band that plays a supportive role for the shoulder joint.* Coracoacromial prevents Upward displacement of humeral head.", 'role': 'assistant'}]