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
Neurofibromatosis I is most commonly associated with - 
Select and explain. 
A. Brain stem gliomas, B. Optic pathway glioma, C. Sub ependymal pilocytic astrocytoma, D. Glioblastoma multiforme
B: Optic pathway glioma
Answer: B: Optic pathway glioma 
Explanation: None