This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: CNS Tumors, Subject name: Surgery
Prophylactic craniospinal irradiation is recommended in: 
Select and explain. 
A. Astrocytoma, B. Posterior fossa ependymoma, C. Meningioma, D. Medulloblastoma
D: Medulloblastoma
Answer: D: Medulloblastoma 
Explanation: PROPHYLACTIC CRANIOSPINAL IRRADIATION Prophylactic craniospinal irradiation is useful in CNS malignancy which disseminate CSF or any malignancy with high risk of CNS spreadQ. Common Indications Less Common Indications MedulloblastomaQ GlioblastomaQ GerminomaQ Small cell Carcinoma of LungQ ALLQ Non-Hodgkin's LymphomaQ Leptomeningeal RhabdomyosarcomaQ