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: Surgery
[{'content': 'The most malignant brain tumour is \nSelect and explain. \nA. Ependymoma, B. Medulloblastoma, C. Oligodendroglioma, D. Glioblastoma multiforme', 'role': 'user'}, {'content': 'Answer: D \nExplanation: (D) Glioblastoma multiforme # Glioblastoma multiforme (GBM), WHO classification name "glioblastoma", also known as Grade IV Astrocytoma, is the most common and most aggressive malignant primary brain tumor in humans, involving glial cells and accounting for 52% of all functional tissue brain tumor cases and 20% of all intracranial tumors.', 'role': 'assistant'}]