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 midpalatal suture is most likely to open at which of the following ages of expansion? 
Select and explain. 
A. 18 years old, B. 13 years old, C. 25 years old, D. 55 years old
B: 13 years old
Answer: B: 13 years old 
Explanation: None