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
One of the following statement is unique about circumpulpal dentine 
Select and explain. 
A. Collagen fibers are oriented perpendicular to DEJ, B. Vonkorff fibers are present, C. Contain phosphophoryn, D. Requires matrix vesicle for mineralization
C: Contain phosphophoryn
Answer: C: Contain phosphophoryn 
Explanation: None