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: Pathology
[{'content': 'All of the following are neuronal tumors, except- \nSelect and explain. \nA. Gangliocytoma, B. Ganglioglioma, C. Neurocytoma, D. Ependymoma', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Conventional classification of CNS tumors\n\nConventionally, CNS tumors are classified into following three groups:-\n\n\nGlial tumors :- Primary tumors of the CNS that arise from the three glial cells present in the CNS, i.e., astrocytes, oligodendrocytes and ependymal cells. Examples are astrocytomas, oligodendrogliomas, ependymomas, mixed gliomas.\nNeuronal tumors :- Primary tumors of the CNS that contain mature appearing neurons or show neuronal lineage. Examples are neurocytomas, gangliocytomas and gangliogliomas.\nEmbroyonal tumors (poorly differentiated tumors) :- Primary tumors of the CNS which thought of neuroectodermal origin express few if any phenotype features of mature cells of the nervous system. Examples are medulloblastomas, neuroblastomas and ependymoblastomas.', 'role': 'assistant'}]