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': 'The ocular features of retinitis pigmentosa include – \nSelect and explain. \nA. Bony corpuscular appearance, B. Waxy pallor of the optic disc, C. Attenuation of the retinal arterioles, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Clinical features of retinitis pigmentosa\n\nRetinal pigmentary changes (Bone spicule intraneural retinal pigmentation) : - Retina studded with small, jet-black spots resembling bone corpuscles with a spidery outline. These pigmentary changes are typically perivascular and retinal veins (never arteries) have a sheath of pigment for part of their course. These changes affect equatorial region initially sparing the posterior pole and periphery. Later in the course of disease whole retina is involved.\nAttenuated and thread like retinal arterioles and veins.\nPale and waxy optic disc (consecutive optic atrophy).\nThinning and atrophy of retinal pigment epithelium (RPE) in mid and far peripheral retina with relative sparing of RPE at macula.', 'role': 'assistant'}]