This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Virology, Subject name: Microbiology
Which one of the following would be the treatment of choice for HSV infection? 
Select and explain. 
A. Acyclovir, B. Killed virus vaccine, C. Herpes immune globulin, D. Azithromycin
A: Acyclovir
Answer: A: Acyclovir 
Explanation: Acyclovir is an analogue of guanosine or deoxyguanosine that strongly inhibits herpes simplex virus (HSV) but has little effect on other DNA viruses. When employed for the treatment of primary genital infection by HSV, both oral and intravenous formulations have reduced viral shedding and shortened the duration of symptoms.