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': 'In a patient with AIDS chorioretinitis is typically caused by: \nSelect and explain. \nA. Cytomegalo virus, B. Toxoplasma gondi, C. Cryptococcus neoformans, D. All of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. Cytomegalo virus', 'role': 'assistant'}]