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
[{'content': 'Rossette shaped arrangement of Cells are seen in: \nSelect and explain. \nA. Thecoma ovary, B. Ependymoma, C. Neurofibroma, D. Lymphoma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ependymoma', 'role': 'assistant'}]