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
The pocket epithelium shows a series of histopathological changes. Which of the following is true in this regard? 
Select and explain. 
A. Necrotic changes, B. Proliferative changes, C. Degenerative changes, D. Proliferative and degenerative changes
D: Proliferative and degenerative changes
Answer: D: Proliferative and degenerative changes 
Explanation: None