<prompt> Neurofibromatosis I is most commonly associated withBrain stem gliomasOptic pathway gliomaSub ependymal pilocytic astrocytomaGlioblastoma multiforune  <response>: 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. 