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
Which is not a neuronal tumour 
Select and explain. 
A. Ependymoma, B. Neuroblastoma, C. Gangliocytoma, D. Ganglioglioma
A: Ependymoma
Answer: A: Ependymoma 
Explanation: 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