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': 'Attenuated retinal vessels with bony corpuscular like lesion seen in – \nSelect and explain. \nA. Diabetes mellitus, B. Hypertension, C. Retinitis pigmentosa, D. Eales disease', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Attenuated & thread like retinal vessels and retinal pigmentary changes (Bone spicule intraneural retinal pigmentation) is seen in retinitis pigmentosa.', 'role': 'assistant'}]