This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nervous System, Subject name: Surgery
[{'content': 'A 23-year-old woman complains of progressive loss of vision and papilledema. Investigations show normal findings on CT scan. A lumbar puncture shows marked elevation of pressure. What is the most likely diagnosis? \nSelect and explain. \nA. Pseudotumor cerebri, B. Corpus cavernous thrombosis, C. Cavernous sinus thrombosis, D. Retinoblastoma', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Pseudotumor cerebri is a condition that most commonly occurs in young adults, particularly in females. In this condition, ICP as measured by a lumbar puncture is elevated, while the size of the cerebral ventricles on imaging studies is small or normal. It is a generally progressive condition that causes headache and damage to the optic nerve, sometimes leading to loss of peripheral vision and blindness.', 'role': 'assistant'}]