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
With the increase in age keratinisation of gingiva 
Select and explain. 
A. Increases, B. Decreases, C. Remains the same, D. Increases and then decreases
B: Decreases
Answer: B: Decreases 
Explanation: None