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': 'Intermittent proptosis is a sign of: \nSelect and explain. \nA. Pseudotumour, B. Carotico-cavernous fistula, C. Capillary haemangioma, D. Orbital varices', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. Orbital varices', 'role': 'assistant'}]