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: Answer is B (Optic Nerve Glioma): Optic Gliomas are present in about 15 to 25% of patient with NF-I and its presence is included as one of the criteria in establishing its diagnosis (Diagnostic criteria in NFl) Optic Gliomas are the most common intracranial tumors of Neurofibromatosis 1- Child Neurology