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': 'Most common cause of clicking \nSelect and explain. \nA. Disc displacement with reduction, B. Disc displacement without reduction, C. Hypermobility, D. Loose articular bodies', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]