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: 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. is 'b' i.e., Neurofibroma", 'role': 'assistant'}]