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': 'The most common benign tumour of the orbit is: \nSelect and explain. \nA. Optic nerve glioma, B. Meningioma, C. Benign-mixed tumour, D. Haemangioma', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. Haemangioma', 'role': 'assistant'}]