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
The cells that form secondary dentin are 
Select and explain. 
A. Cementoblasts, B. Fibroblasts, C. Odontoblasts, D. Osteoblasts
C: Odontoblasts
Answer: C: Odontoblasts 
Explanation: None