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: Radiology
[{'content': 'A 48 yr old woman comes with b/1 progressive weakness of both lower limbs, spasticity & mild impairment of respiratory movements. MRI shows an intradural mid-dorsal midline enhancing lesion. What is the likely diagnosis: \nSelect and explain. \nA. Intradural lipoma, B. Meningioma, C. Neuroenteric cyst, D. Dermoid cyst', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. Meningioma', 'role': 'assistant'}]