This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Neoplasia, Subject name: Surgery
[{'content': 'Dumbell tumour is seen in: \nSelect and explain. \nA. Meningioma, B. Neurofibroma, C. Ependymoma, D. Thymoma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans: b (Neurofibroma)Ref: Bailey & Love, 24th ed, p. 864 & 23rd ed, p. 792', 'role': 'assistant'}]