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': 'Which is the most common retrobulbar orbital mass in adults? \nSelect and explain. \nA. Meningioma, B. Neurofibroma, C. Schwannoma, D. Cavernous hemangioma', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Cavernous hemangiomas are the most common benign orbital tumors in adults. This tumor is usually located in the retroorbital cone. It is composed of numerous dilated vascular spaces of variable size and are surrounded by a fibrous capsule. On CT and MRI, the tumor appear as sharply marginated, round to oval, somewhat flattened mass that abut from the posterior wall of the globe. Ref: Diagnostic and Interventional Neuroradiology By Klaus Saor, G. Albrecht, Page 135.', 'role': 'assistant'}]