**Question:** All of the following are known complications of ulcerative colitis except:

A. Colorectal cancer
B. Perianal abscess
C. Hepatitis
D. Pulmonary tuberculosis

**Core Concept:** Ulcerative colitis (UC) is a subtype of inflammatory bowel disease (IBD) characterized by chronic inflammation of the colon, leading to symptoms like diarrhea, bleeding, and abdominal pain. The inflammation can lead to various complications, including those related to the gastrointestinal tract, such as colorectal cancer, perianal abscess, and ischemic colitis. UC does not typically result in hepatitis or pulmonary tuberculosis as complications.

**Why the Correct Answer is Right:** The correct answer, **D.** Pulmonary tuberculosis, is incorrect because it is not a direct complication of ulcerative colitis. Tuberculosis primarily affects the lungs, and while there have been isolated cases of extrapulmonary tuberculosis, it is not a direct consequence of UC.

**Why Each Wrong Option is Incorrect:**

**A.** Colorectal cancer is a direct complication of long-standing inflammation in UC patients, as the chronic inflammation can lead to dysplasia and eventually cancer.

**B.** Perianal abscesses can develop as a complication of UC due to fissures or fistulas.

**C.** Hepatitis is a liver infection caused by viruses like hepatitis B and C, and is unrelated to the gastrointestinal tract complications of UC.

**Clinical Pearl:** The correct understanding of complications associated with ulcerative colitis is essential for healthcare providers treating patients with IBD. Adequate surveillance, management, and treatment can prevent or minimize these complications, leading to better patient outcomes.