Final answer:
Acyclovir is the correct antiviral medication to treat a viral infection, as it is known to manage symptoms of herpes simplex virus infections, unlike antibiotics, antifungals, antiparasitics, or antimalarials which target different pathogens.
Step-by-step explanation:
The appropriate medication to treat a patient with a viral infection among the options provided would be acyclovir. This drug is an antiviral that is specifically designed to treat herpes simplex virus infections, such as genital herpes. Acyclovir works by reducing the number and duration of herpes outbreaks, helping to manage symptoms, although it does not cure the virus which remains latent in the body. It's important to note that antibiotics like amoxicillin are not effective against viruses, and are used to treat bacterial infections. Other options listed, such as echinocandins (antifungal), albendazole (antiparasitic), and chloroquine (antimalarial), are not suitable for treating viral infections.