<prompt> A man presented with diarrhea and lower abdominal pain. The stool is heme-positive. Investigation of choice for amoebiasis is?ELISAColonoscopyMicroscopyMicroscopy ELISA  <response>: Amebiasis is infection with the parasitic intestinal protozoan Entamoeba histolytica the tissue-lysing ameba. The most common extraintestinal manifestation of amebiasis is amebic liver abscess. Microscopy, often combined with enzyme-linked immunosorbent assays ELISAs, remains the standard diagnostic approach. Ref: Stanley, S.L. 2012. Chapter 209. Amebiasis and Infection With Free-Living Amebas. In D.L. Longo, A.S. Fauci, D.L. Kasper, S.L. Hauser, J.L. Jameson, J. Loscalzo Eds, Harrisons Principles of Internal Medicine, 18e. 