This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.N.S, Subject name: Medicine
[{'content': 'Neurofibromatosis I is most commonly associated with \nSelect and explain. \nA. Brain stem gliomas, B. Optic pathway glioma, C. Sub ependymal pilocytic astrocytoma, D. Glioblastoma multiforune', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Robbins and cotran Pathologic basis of disease-south asia edition, 9 edition * NF1 is characterised by neurofibromas of peripheral nerve, gliomas of optic nerve,Lisch nodules and cafe au lait spots.', 'role': 'assistant'}]