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
Matrix vesicles play important role in the mineralization of 
Select and explain. 
A. Dentin, B. Enamel, C. Pulp, D. Periodontal ligament
A: Dentin
Answer: A: Dentin 
Explanation: None