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: Dental
Which type of trauma is associated with destruction of protective layer? 
Select and explain. 
A. Intrusion, B. Extrusion, C. Avulsion, D. Lateral luxation
A: Intrusion
Answer: A: Intrusion 
Explanation: None