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
All are used for AIDS except- 
Select and explain. 
A. Fanciclovir, B. Ritonavir, C. Stavudine, D. Indinavir
A: Fanciclovir
Answer: A: Fanciclovir 
Explanation: None