Which statement regarding irritable bowel syndrome (IBS) is incorrect?
a. Consuming large meals at regular intervals during the day may be an effective treatment in preventing IBS symptoms.
b. Symptoms of IBS include gas, bloating, diarrhea and/or constipation.
c. Avoiding foods that aggravate symptoms, dietary fiber, and peppermint oil are all recommended treatments for IBS.
d. The exact cause of IBS is not known.