This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Inflammatory Bowel Disease, Subject name: Medicine
Ulcterative colitis associated features include all except: 
Select and explain. 
A. Iritis, B. Ahritis, C. Urethritis, D. Pyoderma
C: Urethritis
Answer: C: Urethritis 
Explanation: Bloody diarrhea is the hallmark feature of ulcerative colitis. Extracolonic manifestations include: Erythema nodosum Pyoderma gangrenosum Episcleritis Iritis Thrombo-embolic events Oligo-aicular, non-deforming ahritis. In patients who are HLA B27-seropositive, there may be anterior uveitis or ankylosing spondylitis which is independent of colitis activity.