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
Which of the following is a component of matrix vesicles 
Select and explain. 
A. Alkaline phosphatase, B. Calcium ATPase, C. Metallo proteinase, D. All
D: All
Answer: D: All 
Explanation: None