While on a backpacking trip in Maine, Julie and her friends obtained their drinking water from several different pristine streams, adding one or two drops of bleach to ensure its safety. Several days later Julie began experiencing abdominal distress, specifically cramping, fatty diarrhea, and flatulence. When it didn't clear up within several days, Julie visited her doctor. Which of the following would be the most likely cause of Julie's symptoms?
A. E. coli O157:H7
B. Giardia intestinalis
C. Toxoplasma gondii
D. Entamoeba histolytica
E. Schistosoma mansoni
Answer: B
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