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: Anatomy
The ossification center of pisiform bone appears at the age of - 
Select and explain. 
A. 10-11 years, B. 12-13 years, C. 14-15 years, D. 15-16 years
B: 12-13 years
Answer: B: 12-13 years 
Explanation: None