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
Most Extensive vascular system among the following is found in 
Select and explain. 
A. Cell free zone, B. Cell rich zone, C. Odontoblastic zone, D. None of the above
B: Cell rich zone
Answer: B: Cell rich zone 
Explanation: None