Drug effective in ulcerative colitis is:
**Core Concept**
Inflammatory bowel diseases like ulcerative colitis involve chronic inflammation of the colonic mucosa, leading to symptoms like diarrhea, abdominal pain, and rectal bleeding. Treatment aims to reduce inflammation and manage symptoms.
**Why the Correct Answer is Right**
The correct answer is an immunosuppressive agent that targets T-lymphocytes, which play a key role in the pathogenesis of ulcerative colitis. By inhibiting the proliferation of T-lymphocytes, this drug reduces inflammation and promotes mucosal healing. The exact mechanism involves the inhibition of the purine synthesis pathway, which is essential for lymphocyte proliferation.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it is a corticosteroid, which may provide temporary relief from symptoms by reducing inflammation, but it does not address the underlying pathophysiology of ulcerative colitis.
**Option B:** This option is incorrect because it is an anticholinergic agent, which can help manage symptoms like diarrhea and abdominal pain by reducing gut motility, but it does not have a significant impact on inflammation.
**Option C:** This option is incorrect because it is an antibiotic, which may be used to manage complications like pouchitis in patients with ulcerative colitis, but it is not a primary treatment for the disease.
**Clinical Pearl / High-Yield Fact**
When managing ulcerative colitis, it's essential to remember that immunosuppressive agents like the correct answer can increase the risk of infections, particularly opportunistic infections.
**Correct Answer:** C.