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: Dental
Herpes resistant to acyclovir is treated by – 
Select and explain. 
A. Foscarnet, B. Lamivudine, C. Ganciclovir, D. Valacyclovir
A: Foscarnet
Answer: A: Foscarnet 
Explanation: Foscarnet is approved for Acyclovir resistant mucocutaneous HSV infection.