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: Orthopaedics
[{'content': 'Earliest site of bone involvement in hematogenous osteomyelitis - \nSelect and explain. \nA. Metaphysis, B. Diaphys is, C. Epiphysis, D. Point of entry of the nutrient artery', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Metaphysis of long bone is the earliest and most common site involved.', 'role': 'assistant'}]