This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Virology (General Propeies, DNA Viruses), Subject name: Microbiology
[{'content': 'An HIV patient complains of visual disturbances. Fundal examination shows bilateral retinal exudates and perivascular haemorrhages. Which of the following viruses are most likely to be responsible for this retinitis- \nSelect and explain. \nA. Herpes simplex, B. Varicella zoster, C. Cytomegalovirus, D. EBV', 'role': 'user'}, {'content': 'Answer: C \nExplanation: This is a typical feature of Cytomegalovirus (CMV) retinitis. Pizza pie appearance of fundus in CMV retinitis.(In HIV +ve patient, if CD4+ count is <50 cells/ microlitre) Herpes simplex- type 1 : conjuctivitis and corneal ulceration. Varicella zoster-corneal ulcer and zoster opthalmicus. EBV- not associated with retinitis.', 'role': 'assistant'}]