This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cornea and sclera, Subject name: Ophthalmology
[{'content': 'All of the following are true for anaemic retinopathy except \nSelect and explain. \nA. Occurs when haemoglobin level falls below 5 gm%, B. Aerioles become pale, C. Veins are pale and narrow, D. Superficial retinal and subhyaloid haemorrhage are seen', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Anaemic retinopathy In anaemia, retinal changes are liable to occur when haemoglobin level falls by 50 percent and are consistently present when it is below 35 percent (5 gm%). Anaemic retinopathy is characterised by pale aerioles and a pale general background of the fundus. Retinal veins are dilated. Superficial retinal and preretinal (subhyaloid) haemorrhages may be seen in posterior half of the fundus. A few haemorrhages have white centres (Roth spots). Rarely, a few soft exudates (cotton-wool patches) may also be present. Ref:- A K KHURANA; pg num:-264', 'role': 'assistant'}]