WHO grade I tumour is located in Cerebellum On histological examination Rosenthal fibres seen what is the most probable diagnosis?: (A) Medulloblastoma, (B) Crainopharyngioma, (C) Pilocytic astrocytoma, (D) Ependymoma
Answer is C. Pilocytic astrocytoma :

WHO grade I tumour.
Usually occurs in Cerebellum.
Biphasic tumour.
Rosenthal fibres seen.