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': 'About retinitis pigmentosa, all are true EXCEPT: September 2012 \nSelect and explain. \nA. Ring scotoma, B. Central scotoma, C. Waxy pallor of disc, D. Bone spicule pigmentation in retina', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B i.e. Central scotoma Retinitis pigmentosa Feature: Loss of visual acuity Microscopy: Irregular black deposits of clumped pigment in the peripheral retina (Bone spicules)', 'role': 'assistant'}]