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: Pediatrics
[{'content': 'Common posterior cranial fossa tumours include all of following except – \nSelect and explain. \nA. Medulloblastoma, B. Oligodendroglioma, C. Ependymoma, D. Cystic astrocytoma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Oligodendrogliomas are uncommon tumours of childhood, occur predominently in the cerebral cortex and originate in white matter (Supratentorial).\n\nCommon childhood infratentorial post fossa tumors\n\nCerebellar astrocytoma (cystic astrocytoma)\xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 3) Brainstem glioma\n\n2. MedullOblastoma (Primitive neuroectodennal tumor)\xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa04) Ependymoma', 'role': 'assistant'}]