<prompt> Most common protozoan parasite isToxoplasma gondiiTrypanosomaPlasmodiumAll of the above  <response>: Toxoplasma gondii is an obligate intracellular parasitic one-celled eukaryote that causes the infectious disease toxoplasmosis domestic cats, are the only known definitive hosts in which the parasite may undergo sexual reproduction.In humans, T. gondii is one of the most common parasites in developed countries. 