This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Skeletal Infections, Subject name: Orthopaedics
[{'content': 'Most vascular zone of the bone is - \nSelect and explain. \nA. Metaphysis, B. Diaphysis, C. Epiphysis, D. Medullary Cavity', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Metaphysis o Metaphysis is the most vascular zone of the bone especially in children as it has long hairpin loop arranged arterioles and venules running through it.", 'role': 'assistant'}]