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
Cell rich zone is rich in 
Select and explain. 
A. Fibroblasts, B. Mesenchymal cells, C. Odontoblast, D. Ameloblast
A: Fibroblasts
Answer: A: Fibroblasts 
Explanation: None