[Verified Answer]: A 32-year-old man visiting from Thailand…

A 32-year-old man visiting from Thailand presents with diarrhea and fatigue for the past 6 days, which began before he left home. The patient denies nausea, vomiting. or recent use of laxatives. He does not take any regular medications. Vital signs: temperature 37.7deg C (99.8deg F), heart rate 105/min, respiratory rate 16/min, and blood pressure 80/50 mm Hg. On physical examination, he is pale with dry mucous membranes. A stool sample is obtained for culture, which is copious and appears watery without blood. Which of the following is the most likely cause of this patient’s diarrhea?A.Secretory diarrheaB.Motility diarrheaC.Invasive diarrheaD.Osmotic diarrheaE.Steatorrhea