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 45 year old female presented with lower limb weakness, spasticity, urinary hesitancy and mid-dorsal intradural enhancing mass in Mill. What is the diagnosis – \nSelect and explain. \nA. Lipoma, B. Meningioma, C. Dermoid cyst, D. Neuroepithelial cyst', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The mass in question has the following information :\n\n\nMiddle-aged (45 years) women\nMid-dorsal (mid thoracic)\nIntradural\nEnhancing\n\n\nAll are features of meningioma.\nLipoma, Dermoid, and neuroepithelial tumors, i.e. gliomas (e.g. - astrocytoma) are intramedullary masses.', 'role': 'assistant'}]