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
Is not true about soft exudates (cotton wool patches on retina): 
Select and explain. 
A. Are a sign of retinal hypoxia, B. Formed due to swelling of nerve fibre layer, C. Frequently change their shape, D. In late stages are conveed into hard exudates
D: In late stages are conveed into hard exudates
Answer: D: In late stages are conveed into hard exudates 
Explanation: Ans. In late stages are conveed into hard exudates