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': 'Cotton wool spots are commonly seen in A/E: \nSelect and explain. \nA. HIV, B. DM, C. Hypeension, D. CMV', 'role': 'user'}, {'content': 'Answer: D \nExplanation: D i.e. CMV Among HIV, DM, hypeension and CMV, CMV is the least common cause of cotton wool spots.', 'role': 'assistant'}]