This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.N.S, Subject name: Medicine
[{'content': 'A man with painful opthalmoplegia, cavernous sinus dilatation: diagnosis is \nSelect and explain. \nA. Gradinego syndrome, B. Tolosa Hunt syndrome, C. Cavernous sinus thrombosis, D. Orbital pseudotumour', 'role': 'user'}, {'content': "Answer: B \nExplanation: Tolosa-Hunt syndrome (THS) is a painful ophthalmoplegia caused by nonspecific inflammation of the cavernous sinus or superior orbital fissure. Cavernous sinus thrombosis symptoms include: decrease or loss of vision, chemosis, exophthalmos (bulging eyes), headaches, and paralysis of the cranial nerves which course through the cavernous sinus. Gradenigo's syndrome, is a complication of otitis media and mastoiditis involving the apex of the petrous temporal bone. Orbital pseudotumor is the most common painful orbital mass in the adult population, and is associated with proptosis, cranial nervepalsy (Tolosa-Hunt syndrome), uveitis, and retinal detachment. Ref Harrison20th edition pg 2456", 'role': 'assistant'}]