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
[{'content': 'Prophylactic craniospinal irradiation is recommended in: \nSelect and explain. \nA. Astrocytoma, B. Posterior fossa ependymoma, C. Meningioma, D. Medulloblastoma', 'role': 'user'}, {'content': "Answer: D \nExplanation: 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", 'role': 'assistant'}]