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: 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 multiforme', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]