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
Calculocementum 
Select and explain. 
A. Non-calcified structures, B. Calculus embedded deeply in cementum, C. Non-attachment mechanisms, D. Non similar to cementum
B: Calculus embedded deeply in cementum
Answer: B: Calculus embedded deeply in cementum 
Explanation: None