This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Central Nervous system, Subject name: Pediatrics
[{'content': "Second most common neoplasm seen in children is \nSelect and explain. \nA. Lyphoma, B. Brain tumor, C. Wilm's tumor, D. Neuroblastoma", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Also called low-grade gliomas, these are the most common brain tumors in children. Medulloblastomas are the most common type of childhood brain cancer. Most medulloblastomas occur before age 10. Ependymomas are a type of childhood brain tumor that can be benign (noncancerous) or malignant (cancerous). The most common cancers of children are: Leukemia. Brain and spinal cord tumors. Neuroblastoma. Wilms tumor. Lymphoma (including both Hodgkin and non-Hodgkin) Rhabdomyosarcoma. Retinoblastoma. Bone cancer (including osteosarcoma and Ewing sarcoma) Reference: GHAI Essential pediatrics, 8th edition', 'role': 'assistant'}]