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: Medicine
[{'content': 'A 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 virus, B. Human herpes virus 8, C. Cytomegalovirus, D. Epstein-Barr (EB) virus', 'role': 'user'}, {'content': "Answer: C \nExplanation: CMV retinitis is the most common ocular infection in AIDS patient.\n\nCMV retinitis\nPresentation :\n\nPresents as a painless progressive loss of vision.\nPatients may also complain of 'blurred vision', Floaters and scintillations.\n\nOpthalmoscopic findings : (Bilateral)\n\nCharacteristic retinal appearance ofperivascular haemorrhages and retinal exudates - Harrison\nCotton wool spots appearing as a result of focal ischaemia of nerve fibre layer are characteristic\n\nRisk factors :\n\nThe majority of cases of CMV retinitis occur in patients with CD4+ count < 50/ 1.\nPatients with CD4+ count < 100 / 1 should undergo an ophthalmic examination every 3-6 months.\n\nTreatment:\n\n\nTherapy for CMV retinitis consists of intravenous ganciclovir\nForscarnet (cidofovir is an alternative).", 'role': 'assistant'}]