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A 21-year-old man has weight loss and severe intermittent bloody diarrhea. A barium enema and colonoscopy show multiple ulcers and inflammatory changes extending from the rectum to the mid-transverse colon. Biopsy specimens taken from multiple sites show acute and chronic inflammation restricted to the mucosa. Which of the following is the most likely diagnosis?

(A) AIDS-associated gastroenteritis
(B) Amebiasis
(C) Crohn disease
(D) Clostridium difficile-associated colitis
(E) Escherichia coli-associated colitis
(F) Ischemic colitis
(G) Salmonella gastroenteritis
(H) Ulcerative colitis
 
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