A 30 year-old housewife presents with chronic persistent diarrheas for 6 weeks. Which of the following symptoms would MOST suggestive of a pathological cause of her diarrhea?
A. More than 3 episodes of diarrhea per day.
B. Having a sensation of active bowel movement
C. Nocturnal diarrhea with 2-3 episodes after sleep.
D. Abdominal pain
E. Similar episodes 2 years ago