This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nervous System, Subject name: Surgery
[{'content': 'Which is the most common brain tumor \nSelect and explain. \nA. Secondaries, B. Medulloblastoma, C. Glioblastoma, D. Craniopharyngioma', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) SecondariesRef: Sabiston 20th Page 1915* MC tumors in brain-Metastasis (70% are multiple)* MC site of Mets-Cerebral hemispheres.* MC primary to produce Brain secondary- LUNG > BREAST* MC Suprasellar mass in Children-Craniopharyngioma* MC suprasellar mass in adults- Pituitary adenoma', 'role': 'assistant'}]