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
[{'content': 'Primary center of ossification appears in - \nSelect and explain. \nA. Epiphysis, B. Metaphysis, C. Diaphysis, D. None', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Primary center of ossification → in diaphysis\nSecondary centers of ossification → in epiphysis', 'role': 'assistant'}]