Which medication is typically classified under the treatment of herpes virus?

Acyclovir is the medication that is specifically classified for the treatment of infections caused by the herpes virus, including herpes simplex and varicella-zoster viruses. It works by inhibiting the viral DNA synthesis, which is crucial for the replication of the virus. By interfering with this process, acyclovir helps to reduce the severity and duration of symptoms associated with herpes outbreaks.

In contrast, Amantadine is primarily used for the treatment and prevention of influenza A virus infections and Parkinson's disease. Oseltamivir is indicated for the treatment of influenza, specifically targeting the influenza virus, and does not have activity against herpes viruses. Sofosbuvir is an antiviral medication used for the treatment of hepatitis C, which does not overlap with the treatment of herpes virus infections. Thus, acyclovir’s specific action against herpes makes it the correct choice for this question.