Which of the following is NOT a complication of diverticulitis?

Lactose intolerance is not a complication of diverticulitis. Diverticulitis is primarily associated with inflammation of the diverticula in the colon, which can lead to various complications. The complications typically include perforation, where an inflamed diverticulum can rupture, leading to peritonitis; hemorrhage, which can occur due to erosion of blood vessels by inflamed diverticula; and strictures or obstruction, which can develop as a result of repeated episodes of inflammation that scarring involves.

In contrast, lactose intolerance is a condition where the body is unable to properly digest lactose, a sugar found in milk and dairy products. It is related to the deficiency of the enzyme lactase and is not directly linked to diverticular disease or its complications. Thus, identifying lactose intolerance as not being a complication of diverticulitis reflects an understanding of the distinct pathophysiological processes involved in each condition.