This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Tumors, Subject name: Ophthalmology
[{'content': 'The most common benign tumour of the orbit is \nSelect and explain. \nA. Haemangioma, B. Optic nerve glioma, C. Benign-mixed tumour, D. Meningioma', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Vascular tumours : Vascular tumours are the most common primary benign tumours of the orbit. These can be either haemangiomas or lymphangiomas. Haemangiomas are fuher divided into two types -- capillary and cavernous. Ref:- A K KHURANA; pg num:-393', 'role': 'assistant'}]