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
The antiviral drug used for treatment of cytomeglovirus retinitis is: 
Select and explain. 
A. Acyclovir, B. Ganciclovir, C. Triflurothymidine, D. All of the above
B: Ganciclovir
Answer: B: Ganciclovir 
Explanation: Ans. Ganciclovir