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
A patient presented with peripheral field loss and fundus examination shows waxy exudates & pale disc with pigmentation around retinal vessels, diagnosis is 
Select and explain. 
A. Behcet's syndrome, B. Chorio- retinitis, C. Open angle glaucoma, D. Retinitis-pigmentosa
D: Retinitis-pigmentosa
Answer: D: Retinitis-pigmentosa 
Explanation: D i.e. Retinitis-pigmentosa