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': 'Anterior disc displacement with intermittent locking is: \nSelect and explain. \nA. Type 1, B. Type 2, C. Type 3, D. Type 4', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Disk displacement is divided into stages based on sign and symptoms combined with results of aging studies. A simple classification system divides ADD in to\n\nanterior disc displacement with reduction (clicking joint)\nanterior disc displacement with intermittent locking\nanterior disc displacement without reduction (closed lock)', 'role': 'assistant'}]