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: Skin
Herpes resistant to acyclovir is treated by 
Select and explain. 
A. Foscarnet, B. Lamivudine, C. Ganciclovir, D. Valocyclovir
A: Foscarnet
Answer: A: Foscarnet 
Explanation: A. i.e. Foscarnet Acyclovir is drug of primary choiceQ for herpes infection and foscarnet is drug of choice for acyclovir resistance HSV, herpes zoster & varicella zoster infectionQ.