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: Pathology
[{'content': 'Medulloblastoma most common metastasis is to - \nSelect and explain. \nA. Lung, B. CNS, C. Liver, D. Spleen', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Medulloblastoma spread through CSF and frequently metastasizes to different locations in the brain and spine.\nExtraneural metastasis to the rest of the body is rare.\nMedulloblastoma is an infratentorial tumor and occurs exclusively in the cerebellum.\n\nMedulloblastoma\n\nMedulloblastoma is an infratentorial tumor.\nThe tumour occurs predominantly in children and exclusively in the cerebellum.\nTumour metastasizes through the CSF to the distant sites as bones or bone marrow.\nRadiotherapy improves the survival in children. Craniospinal irradiation (CS1) is given and reduced the\xa0recurrence from CSF dissemination.\nThe tumour should be surgically excised.\nThe bad prognostic factors of the medulloblastoma are age < 3yrs,\xa0CSF dissemination, and extent of\xa0resection.', 'role': 'assistant'}]