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
Maximum amount of flouride is absorbed by: 
Select and explain. 
A. Enamel, B. Dentin, C. Cementum, D. Pulp
C: Cementum
Answer: C: Cementum 
Explanation: Enamel 2200 – 3300 ppm
Dentin 200 – 300 ppm
Cementum 4400 ppm
Pulp is 100 – 650 ppm