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: Radiology
[{'content': 'Craniospinal irradiation is used in the Treatment of \nSelect and explain. \nA. Oligodendroglioma, B. Pilocytic astrocytoma, C. Mixed oligoastrocytoma, D. Medulloblastoma', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]