<prompt> WHO grade I tumour is located in Cerebellum On histological examination Rosenthal fibres seen what is the most probable diagnosis?MedulloblastomaCrainopharyngiomaPilocytic astrocytomaEpendymoma  <response>: Pilocytic astrocytoma :WHO grade I tumour.Usually occurs in Cerebellum.Biphasic tumour.Rosenthal fibres seen. 