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
Prophylactic craniospinal irradiation is required in 
Select and explain. 
A. Medulloblastoma, B. Meningoma, C. Oligodendroglioma, D. All of the above
A: Medulloblastoma
Answer: A: Medulloblastoma 
Explanation: 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.