Which drug class is used in the treatment of trematode infections?

The treatment of trematode infections is specifically addressed by antitrematodal drugs. These medications are designed to target and eliminate trematodes, which are a type of parasitic worm commonly known as flukes. The use of antitrematodal drugs is critical in managing infections caused by these parasites, as they have specific mechanisms of action that effectively disrupt the life cycle of trematodes and assist the body's immune response in clearing the infection.

Other drug classes listed, such as antiviral drugs, antibiotics, and antifungal drugs, serve entirely different purposes and target different types of pathogens. Antiviral drugs are aimed at viruses, antibiotics target bacteria, and antifungal drugs are used against fungal infections. Thus, while they are essential in their respective treatments, they are not applicable when dealing specifically with trematode infections. Consequently, the identification of antitrematodal drugs as the correct answer emphasizes the importance of using the appropriate drug class tailored to treat specific parasitic infections.