This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Microbiology
[{'content': 'A patient presents with diarrhoea. analysis of stool on wet mount shows mobile protozoa without RBCs and pus cells. The diagnosis is - \nSelect and explain. \nA. Balantidium coil, B. Giardiasis, C. Trichomonas hominis, D. Entamoeba histolytica', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Giardiasis . Mobile protozoa with absence of RBC's and pus cells in stools in a patient with diarrhoea suggests giardiasis. . In balantidum cob and entomoeba histolytica infections, pus cells and RBC's will be present in stools. Trichomonas hominis is considered as non-pathogenic", 'role': 'assistant'}]