Praziquantel is a drug that is used to rid the body of _____.

Praziquantel is an anthelmintic medication that specifically targets and treats infections caused by certain types of flatworms, particularly tapeworms. It works by causing severe cellular damage to the parasite, leading to paralysis and eventual death. This makes it particularly effective against tapeworms in both humans and animals.

The other options pertain to different types of parasites that require different treatments. Roundworms and hookworms are types of nematodes, which are not affected by praziquantel and typically require other anthelmintic drugs such as pyrantel pamoate or fenbendazole. Fleas are external parasites and are treated with insecticides or acaricides rather than anthelmintics like praziquantel. Thus, the use of praziquantel is specifically focused on addressing tapeworm infestations.