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 25-yrs-old female presented with lower limb weakness, spasticity, urinary hesitancy, mid-dorsal intradural enhancing mass seen in MRI. What is the diagnosis? \nSelect and explain. \nA. Intradural lipoma, B. Meningioma, C. Dermoid cyst, D. Neuroepithelial cyst', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. Meningioma', 'role': 'assistant'}]