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': "A patient presented with peripheral field loss and fundus examination shows waxy exudates & pale disc with pigmentation around retinal vessels, diagnosis is – \nSelect and explain. \nA. Behcet's syndrome, B. Chorioretinitis, C. Open angel glaucoma, D. Retinitis – pigmentosa", 'role': 'user'}, {'content': 'Answer: D \nExplanation: Peripheral visual field defect, pale waxy disc and pigmentation around retinal vessels (perivascular pigmentation) suggest the diagnosis of retinitis pigmentosa.', 'role': 'assistant'}]