This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Systemic Disease, Subject name: Ophthalmology
[{'content': 'Most common ocular infection in AIDS: \nSelect and explain. \nA. Chlamydia, B. Herpes simplex, C. CMV, D. Rubella', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans: c (CMV) Ref: Harrison, 16th ed, p. 1119Most common ocular infection in HIV - CMV retinitisMost common ocular lesion in HIV - HIV microvasculopathyMost common ocular neoplasm in HIV - Kaposi sarcomaEarliest/ most common abnormal/ most consistent finding in HIV - cotton wool spots', 'role': 'assistant'}]