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
The apical foramen of a fully developed permanent tooth is usually tined by 
Select and explain. 
A. Dentin, B. Cementum, C. Epithelial rest cells, D. The Epithelial diaphragm
B: Cementum
Answer: B: Cementum 
Explanation: None