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
Intrinsic fibers of the cementum 
Select and explain. 
A. Are completely calcified, B. Produced by PDL fibers, C. Have uncalcified core, D. Are perpendicular to surface of the root
A: Are completely calcified
Answer: A: Are completely calcified 
Explanation: None