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 maximum life of the deciduous pulp including both prenatal and postnatal times of development
and the period of regression is approximately 
Select and explain. 
A. 8.3 years, B. 9.6 years, C. 10.6 years, D. 12.6 years
B: 9.6 years
Answer: B: 9.6 years 
Explanation: None