This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Uveal Tract, Subject name: Ophthalmology
[{'content': 'The commonest cause of visual loss in AIDS is which one of the following \nSelect and explain. \nA. Toxoplasmosis, B. Herpetic retinitis, C. CMV retinitis, D. HIV retinitis', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. (c) CMV retinitisRef Kanski, p. 442; John Hopkins HIV guide p. 60CMV retinitis is the most commonQ opportunistic ocular infection amongst patients with AIDS and is the most common cause of Visual morbidityQ', 'role': 'assistant'}]