This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Head and neck, Subject name: Surgery
[{'content': 'A 48-year old woman comes with bilateral progressive weakness of both lower limbs, spasticity and mild impairement of respiratory movements. MRI shows an intradural mid-dorsal midline enhancing lesion. What is the diagnosis? \nSelect and explain. \nA. Intradural lipoma, B. Meningioma, C. Neuroenteric cyst, D. Dermoid cyst', 'role': 'user'}, {'content': 'Answer: B \nExplanation: CNS Tumor Intra-axial Extra-axial Neuronal Astrocytoma (Glioma) Lymphoma Pituitary Schwannoma Meningioma Ref: Harrison 19th edition Pgno: 602', 'role': 'assistant'}]