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': "Purtscher's retinopathy is due to \nSelect and explain. \nA. Tubercular hypersensitivity, B. Trauma, C. Tyrosinase deficiency, D. Lipofuschin deposition in RPE", 'role': 'user'}, {'content': 'Answer: B \nExplanation: It is a hemorrhagic vasculopathy associated with severe head trauma.', 'role': 'assistant'}]