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: Surgery
[{'content': 'Prophylactic craniospinal irradiation is required in \nSelect and explain. \nA. Medulloblastoma, B. Meningoma, C. Oligodendroglioma, D. All of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Craniospinal irradiation is required in CNS tumors which can spread through CSF like Medulloblastoma, CNS lymphomas. It is also required in case of highly malignant tumors like glioblastoma multiforme.', 'role': 'assistant'}]