Which illness is associated with contamination from Entamoeba histolytica?

Amoebiasis is the correct answer because it is an illness specifically caused by the pathogenic amoebae Entamoeba histolytica. This organism primarily affects the gastrointestinal tract and can lead to symptoms such as diarrhea, abdominal pain, and dysentery. The transmission of E. histolytica typically occurs through contaminated water or food, particularly in areas with poor sanitation.

In the context of the other provided options, gastroenteritis is a broader term that refers to inflammation of the stomach and intestines and can be caused by various pathogens, including viruses and bacteria, not specifically E. histolytica. Cryptosporidiosis, on the other hand, is caused by the protozoan parasite Cryptosporidium and is unrelated to Entamoeba histolytica. Lastly, hepatitis A is a viral infection affecting the liver, transmitted through fecal-oral routes, but it does not pertain to the amoebic infection caused by E. histolytica. Thus, amoebiasis accurately reflects the specific illness associated with this parasite.