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 fibers are completely calcified found in cementum: 
Select and explain. 
A. Extrinsic fibres., B. Intrinsic fibers., C. Sharpey's fibers., D. All of the above.
B: Intrinsic fibers.
Answer: B: Intrinsic fibers. 
Explanation: None