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
Primary center of ossification appears in - 
Select and explain. 
A. Epiphysis, B. Metaphysis, C. Diaphysis, D. None
C: Diaphysis
Answer: C: Diaphysis 
Explanation: Primary center of ossification → in diaphysis
Secondary centers of ossification → in epiphysis