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
In a patient with AIDS chorioretinitis is typically caused by: 
Select and explain. 
A. Cytomegalo virus, B. Toxoplasma gondi, C. Cryptococcus neoformans, D. All of the above
A: Cytomegalo virus
Answer: A: Cytomegalo virus 
Explanation: Ans. Cytomegalo virus