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
First formed cementum is: 
Select and explain. 
A. Acellular cementum., B. Cellular cementum., C. Afibrillar cementum., D. None.
A: Acellular cementum.
Answer: A: Acellular cementum. 
Explanation: None