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
Width of PDL is 
Select and explain. 
A. 0.10 mm, B. 0.50 mm, C. 0.25 mm, D. 0.75 mm
C: 0.25 mm
Answer: C: 0.25 mm 
Explanation: None