This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Central Nervous System, Subject name: Pathology
[{'content': 'Identigy the Rosette and Diagnosis. \nSelect and explain. \nA. Perivascular pseudorosette, B. Homer Wright rosette, C. True rosette, D. Flexner Wintersteiner rosette', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) Perivascular Pseudorosette*In this pattern, a spoke-wheel arrangement of cells with tapered cellular processes radiates around a wall of a centrally placed vesse*Seen in ependymomas', 'role': 'assistant'}]