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': 'All of the following are true about medulloblastoma except: \nSelect and explain. \nA. Occur predominantly in children, B. Most common site is Vermis, C. Carmustine and vincristine are used for recurrences and in children <3 years to avoid radiation therapy, D. Radiotherapy is the main treatment modality', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Medulloblastoma Most common malignant brain tumor of childhood- M/C site - Cerebellum (vermis) In adults most common site is Lateral Cerebellar hemisphere Most radiosensitive brain tumor Has CSF spread - given Craniospinal irradiation. Treatment - Despite of extreme radiosensitivity, it should be surgically excised. - Surgical excision should be followed by radiotherapy andchemotherapy. - Carmustine (BCNU) and vincristine are primarily used for recurrences, in poor- risk patients, and in children <3 years to avoid radiation therapy.', 'role': 'assistant'}]