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': 'Most common orbital tumor – \nSelect and explain. \nA. Nerve sheath tumor, B. Hemangioma, C. Lymphoma, D. Meningioma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Most common orbital tumor → Cavernous hemangiona.\nMost common malignant orbital tumor → Lymphoma.', 'role': 'assistant'}]