This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nervous system, Subject name: Pathology
[{'content': 'Which is not a neuronal tumour \nSelect and explain. \nA. Ependymoma, B. Neuroblastoma, C. Gangliocytoma, D. Ganglioglioma', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The four major classes of brain tumors are: 1. Gliomas Astrocytoma * Pleomorphic xanthoastrocytoma * Brainstem glioma * Pilocytic astrocytoma * Fibrillary (diffuse) astrocytomas * Glioblastoma * Oligodendroglioma * Ependymoma 2. Neuronal tumors * Ganglion cell tumors * Gangliocytoma * Ganglioglioma * Dysembryoplastic neuroepithelial tumor * Cerebral neuroblastomas 3. Poorly differentiated neoplasm 4. Meningiomas', 'role': 'assistant'}]