<prompt> A patient presents with diarrhoea. analysis of stool on wet mount shows mobile protozoa without RBCs and pus cells. The diagnosis is -Balantidium coilGiardiasisTrichomonas hominisEntamoeba histolytica  <response>: Ans. is b i.e., Giardiasis . Mobile protozoa with absence of RBCs and pus cells in stools in a patient with diarrhoea suggests giardiasis. . In balantidum cob and entomoeba histolytica infections, pus cells and RBCs will be present in stools. Trichomonas hominis is considered as non-pathogenic 