Which parasite can be transmitted through cat feces?

Toxoplasma gondii is the correct answer because it is a protozoan parasite that can be transmitted through the ingestion of oocysts found in the feces of infected cats. Cats are the primary hosts for T. gondii, and they shed these oocysts into the environment. Humans may become infected through contact with contaminated soil, water, or food, particularly if they handle cat litter or unwashed vegetables that have been exposed to cat feces.

The other parasites listed do not involve transmission through cat feces. Schistosoma species are helminths (flatworms) that are usually transmitted through freshwater contaminated with larval forms rather than through cat feces. Giardia lamblia is a protozoan that causes gastrointestinal infection and is primarily transmitted through contaminated water or food, rather than contact with cat feces. Plasmodium species are malaria-causing protozoans that are transmitted by the bite of infected Anopheles mosquitoes, not through cat feces. Hence, Toxoplasma gondii is unique among these options for its association with cats and their waste.