<prompt> Answer this question truthfullyWhat is the diagnostic feature of Entamoeba histolytica, and what is the specific finding in trophozoites that confirms this diagnosis?  <response>: <reason> The diagnostic feature of Entamoeba histolytica is the presence of trophozoites containing endocytosed red blood cells. This specific finding in trophozoites confirms the diagnosis of Entamoeba histolytica. 