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
Age of preoperational stage is 
Select and explain. 
A. 1-2 years, B. 2-7 years, C. 8-11 years, D. 0-2 years
B: 2-7 years
Answer: B: 2-7 years 
Explanation: None