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 is NOT a mechanism by which diabetes influences periodontium? 
Select and explain. 
A. Hyperglycemia, B. Altered collagen metabolism, C. Altered neutrophil chemotaxis, D. Increased vascularity
D: Increased vascularity
Answer: D: Increased vascularity 
Explanation: None