This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Infection, Subject name: Medicine
Which of the following is NOT used in post-exposure prophylaxis for HIV ? 
Select and explain. 
A. Zidovudine + Lamivudine, B. Tenofovir + emtricitabine, C. Stavudine + Didanosine, D. Acyclovir
D: Acyclovir
Answer: D: Acyclovir 
Explanation: The guideline for post exposure prophylaxis in AIDS is dual NIs for low risk exposures,with addition of either a PI or eirenz in high risk exposures.Tenofovir together with emtricitabine is the most widely used dual NI combination . Acyclovir is deoxiguanosine anlogue antiviral drug used as an anti herpes virus drug. Reference .. Harrison20th edition pg 897