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Review Question - QID 213529

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QID 213529 (Type "213529" in App Search)
A 27-year-old Japanese man presents to the emergency department with diarrhea. The patient states that whenever he goes out to eat he experiences bloating, flatulence, abdominal cramps, and watery diarrhea. Today, his symptoms started after he went out for frozen yogurt. The patient is otherwise healthy and is not currently taking any medications. His temperature is 98.0°F (36.7°C), blood pressure is 122/80 mmHg, pulse is 81/min, respirations are 13/min, and oxygen saturation is 99% on room air. Physical exam demonstrates a nontender abdomen and an unremarkable rectal exam with guaiac-negative stools. Which of the following is the most appropriate next step in management?