Which statement correctly describes ulcerative colitis?

• A. It affects the small intestine primarily
• B. It affects the colon primarily
• C. It affects the stomach exclusively
• D. It affects the liver primarily

Answer: (B)

Ulcerative colitis is a chronic inflammatory bowel disease that is confined to the colon. The inflammation is usually limited to the mucosa and submucosa and starts in the rectum, spreading continuously upward through the colon. This colonic, continuous involvement is what sets UC apart from Crohn’s disease, which can affect any part of the GI tract, including the small intestine. The stomach is not the primary site of UC, and while there can be related liver issues (like primary sclerosing cholangitis) in some patients, the disease itself is described by its colon-focused pattern. So, describing ulcerative colitis as affecting the colon primarily best reflects its typical presentation.