What is the relationship between Crohn's disease and inflammatory bowel disease?
A. Inflammatory bowel disease is a type of Crohn's disease.
B. Crohn's disease affects the colon, but inflammatory bowel disease affects the small intestine.
C. In Crohn's disease, small pouches form in the muscularis, while in inflammatory bowel disease, inflammation occurs throughout the digestive tract.
D. Crohn's disease is one of the most common inflammatory bowel diseases.
E. They are two separate diseases, but both affect only the colon.
Answer: D
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