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
Secondary cementum is generally confined to: 
Select and explain. 
A. Cervical third of the root, B. Middle third of the root, C. Apical third of the root No, D. secondary cementum forms
C: Apical third of the root No
Answer: C: Apical third of the root No 
Explanation: None