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 
Select and explain. 
A. Cytomegalovirus, B. Toxoplasma gondii, C. Cryptococcus neoformans, D. Histoplasma capsulatum
A: Cytomegalovirus
Answer: A: Cytomegalovirus 
Explanation: A i.e. Cytomegalovirus CMV is the most common ocular infection Q as well as most common cause of retinitis in patient of AIDS Q. The classical forms of CMV retinitis is haemorrhagic type, which has been called "Crumbled cheese and ketchup" (sauce & cheese) Q or "pizza pie", appearance, brush fire appearanceQ and granular form.