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: Medicine
[{'content': 'A man with painful opthahnoplegia, 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: None', 'role': 'assistant'}]