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': 'Treatment of CMV retinitis in AIDS patient is \nSelect and explain. \nA. Amantadine, B. Fludrabine, C. Oseltamivir, D. Valganciclovir', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Answer- D. ValganciclovirValganciclovir- pro-drug of ganciclovir that is taken orally and is as effective for both induction.', 'role': 'assistant'}]