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: Ophthalmology
[{'content': "Unilateral proptosis with bilateral VIth nerve palsy, diagnosis is: \nSelect and explain. \nA. Grave's disease, B. Retinoblastoma, C. Pseudotumour of orbit, D. Cavernous sinus thrombosis", 'role': 'user'}, {'content': 'Answer: D \nExplanation: D i.e. Cavernous sinus thrombosis', 'role': 'assistant'}]