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 of the following causes most damage to the protective layer of the tooth: 
Select and explain. 
A. Intrusion, B. Extrusion., C. Lateral luxation., D. Concussion.
A: Intrusion
Answer: A: Intrusion 
Explanation: None