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
Intermediate cementum is found at: 
Select and explain. 
A. Coronal portion of the root., B. Apical third of the root., C. Middle third of the root., D. Covers whole the root
B: Apical third of the root.
Answer: B: Apical third of the root. 
Explanation: Intermediate cementum mostly found at apical third of posterior teeth.