This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Tumors of Nervous System, Subject name: Medicine
[{'content': 'Most common site of sub ependymal astrocytoma \nSelect and explain. \nA. Trigone of lateral ventricle, B. Foramen of Munro, C. Temporal horn of lateral ventricle, D. 4th ventricle', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e. Foramen of Munro Most common site of subependymal astrocytoma is Foramen of monro.", 'role': 'assistant'}]