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
High rate of failure after direct pulp capping in primary
teeth is due to 
Select and explain. 
A. Law vascularity of pulp, B. High cellular content of pulp, C. Large number of unmyelinated nerves, D. Narrow ribbon shaped root canals
B: High cellular content of pulp
Answer: B: High cellular content of pulp 
Explanation: None