Irritable bowel syndrome is:
A) an erosion in the wall of the stomach, duodenum, or any other part of the GI tract exposed to gastric juice
B) a lack of the enzyme lactase in the small intestine, producing symptoms of gas production when dairy foods are consumed
C) a chronic disease characterized by periodic disturbances of diarrhea and constipation without clear physical damage
D) a syndrome affecting the intestines characterized by a wide range of symptoms and conditions, ranging from diarrhea to ulcerative colitis and Crohn disease
C
Explanation: If the definition is not memorized, the term irritable "bowel" in the question indicates disturbances of large intestine function, thus eliminating answers A or B. D is eliminated as it adds additional symptoms.
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