What classes of drugs are typically used to treat gastrointestinal worms?

The correct answer identifies the classes of drugs most effective in treating gastrointestinal worms, specifically the azoles and pyrantel. Azoles, which are typically antifungal agents, do have some relevance in the treatment of certain parasitic infections due to their ability to interfere with parasite ergosterol synthesis, although they are not the primary class used for worms. Pyrantel, on the other hand, is a well-established anthelmintic (anti-worm) medication that is particularly effective against a range of nematodes (roundworms) and may also target certain cestodes (tapeworms). It works by causing paralysis of the worms, allowing the host to expel them from the gastrointestinal tract.

Other classes of drugs presented in the choices are primarily targeted towards bacteria and do not have efficacy against gastrointestinal worms. The lack of relevant activity for the choices ensures that azoles and pyrantel stand out as the more appropriate therapeutic options for treating infections caused by gastrointestinal worms.