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': 'Waxy pallor of optic disc is seen in which disease? \nSelect and explain. \nA. Retinitis pigmentosa, B. Retinopathy of prematurity, C. Hypeensive retinopathy, D. Diabetic retinopathy', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Retinitis pigmentosa", 'role': 'assistant'}]