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': 'Most radiosensitive brain tumor is – \nSelect and explain. \nA. Astrocytoina, B. Ependyinoma, C. Medulloblastoma, D. Craniopharyngeoma', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Of all tumors arising within the brain, except lymphoma, medulloblastoma is the most sensitive.', 'role': 'assistant'}]