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 cementum forms throughout the life: 
Select and explain. 
A. Acellular cementum., B. Cellular cementum., C. Afibrillar cementum., D. All of the above.
B: Cellular cementum.
Answer: B: Cellular cementum. 
Explanation: None