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: Pharmacology
Ganciclovir is preferred over acyclovir in the following condition : 
Select and explain. 
A. Herpes simplex keratitis, B. Herpes zoster, C. Chickenpox, D. Cytomegalovirus retinitis in AIDS patients
D: Cytomegalovirus retinitis in AIDS patients
Answer: D: Cytomegalovirus retinitis in AIDS patients 
Explanation: None