This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Childhood tumors, Subject name: Pediatrics
[{'content': 'The most characteristic radiographic sign in a child with leukemia is \nSelect and explain. \nA. Osteoclerosis of the metaphysic, B. Metaphseal translucencieas, C. Perios, D. Osteolytic lesion', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The most characteristic radiological signs in a child with leukemia are metaphyseal lucent band,reduced bone density,lytic bone lesions,metaphyseal coical bone erosions,collapsed veebrae,widening of sutures,and periosteal reactions. Reference: GHAI Essential pediatrics, 8th edition', 'role': 'assistant'}]