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
Purtscher's retinopathy is due to 
Select and explain. 
A. Tubercular hypersensitivity, B. Trauma, C. Tyrosinase deficiency, D. Lipofuschin deposition in RPE
B: Trauma
Answer: B: Trauma 
Explanation: It is a hemorrhagic vasculopathy associated with severe head trauma.