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
Anterior disc displacement with intermittent locking is: 
Select and explain. 
A. Type 1, B. Type 2, C. Type 3, D. Type 4
B: Type 2
Answer: B: Type 2 
Explanation: 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

anterior disc displacement with reduction (clicking joint)
anterior disc displacement with intermittent locking
anterior disc displacement without reduction (closed lock)