This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Surgery
[{'content': 'Recurrent dislocation of shoulder occurs, because of \nSelect and explain. \nA. Incomplete labrum, B. Superadded secondary infection, C. Crushed glenoidal labrum, D. Weak posterior capsule', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. Crushed glenoid labrum,', 'role': 'assistant'}]