Card 7 / 33: A 66 year old woman has new symptoms of profuse watery non-bloody diarrhea. The diarrhea does not improve when oral intake is limited. She has had a 5 pound weight loss. All stool cultures are negative. Fecal leukocytes are negative. A Sudan stain performed on a stool specimen is negative. Stool electrolytes are checked: stool sodium concentration is 85mmol/l and stool potassium concentration is 50mmol/l. Which of the following is the most likely diagnosis?
A) Irritable bowel syndrome
B) Chronic pancreatitis
C) Carcinoid syndrome
D) Ulcerative colitis
E) Abuse of lactulose

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