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
Collagen fibers are absent in: 
Select and explain. 
A. Acellular extrinsic fibre cementum, B. Acellular afibrillar cementum, C. Mixed stratified cementum, D. Intermediate cementum
B: Acellular afibrillar cementum
Answer: B: Acellular afibrillar cementum 
Explanation: None