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: Pathology
Rosenthal fibres are seen in - 
Select and explain. 
A. Pilocytic astrocytoma, B. Glioblastoma, C. Medulloblastoma, D. Ependymoma
A: Pilocytic astrocytoma
Answer: A: Pilocytic astrocytoma 
Explanation: Rosenthal fibers are thick, elongated, "corkscrew" eosinophilic bundles that are found on H&E staining of the brain.
They are seen in the presence of long-standing gliosis, pilocytic astrocytoma, Alexander's disease (a rare leukodystrophy) and fucosidosis.