All are true about Inflammatory Bowel Disease except:

A Ulcerative colitis is limited to the colon and rectum and extends only into the mucosa and submucosa.
B Crohn's disease may involve any area of the GI tract and is typically transmural.
C Most investigators believe that IBD results from the combined effects of alterations in host interactions with intestinal microbiota, intestinal epithelial dysfunction, aberrant mucosal immune responses, and altered composition of the gut microbiome.
D The presence of multiple, separate, sharply delineated areas of disease, resultingin skip lesions, is characteristic of Ulcerative colitis.

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