text: <unk>  is a single celled parasite that infects the gastrointestinal tract of humans.  Trophozoites of D.<unk>  characteristically have two nuclei, hence the 'DI' prefix to the genus name. However, the rest of the genus name indicates that it is an ENTeric AMOEBA and not that it is related to intestinal parasites of the genus Entamoeba. The species name refers to the fact that the trophozoite stages are fragile - they do not survive long in the stool after leaving the body of the human host.
option_0: Dientamoeba fragilis
option_1: Entamoeba histolytica
option_2: Giardia lamblia
option_3: Balantidium coli
option_4: Cryptosporidium hominis
option_5: Clostridium difficile
option_6: Gardnerella vaginalis
option_7: Ascaris lumbricoides