Which condition is characterized by the formation of abdominal sacs in the colon?

The condition characterized by the formation of abdominal sacs in the colon is diverticulitis. Diverticulitis occurs when diverticula, which are small, bulging pouches that can form in the lining of the digestive system, become inflamed or infected. These diverticula typically develop in the colon, and their presence is often called diverticulosis. When these pouches become inflamed, it leads to diverticulitis, which can cause symptoms such as abdominal pain, fever, and changes in bowel habits.

In contrast, celiac disease is an autoimmune disorder where the ingestion of gluten leads to damage in the small intestine, but it does not involve the formation of sacs in the colon. Ulcerative colitis is an inflammatory bowel disease that results in long-lasting inflammation and ulcers in the digestive tract, particularly affecting the colon, but it does not cause the formation of pouches. A bowel obstruction refers to a blockage in the intestine that prevents food or liquid from passing through and is not linked to the creation of diverticula.

Thus, diverticulitis is distinct in that it specifically involves the presence of these pouches in the colon, making it the correct answer.