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
Exclusively called cervical cementum is: 
Select and explain. 
A. Acellular extrinsic fibre cementum., B. Acellular afibrillar cementum., C. Cellular intrinsic fiber cementum., D. Cellular mixed fiber cementum.
B: Acellular afibrillar cementum.
Answer: B: Acellular afibrillar cementum. 
Explanation: Acellular afibrillar cementum is called cervical cementum, as they are found at cervical portion of the root only.