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
[{'content': 'Which of the following is a feature of Ulcerative colitis? \nSelect and explain. \nA. Spiking fever, B. Proctitis, C. Fistula formation, D. Cobble stone mucosa', 'role': 'user'}, {'content': "Answer: B \nExplanation: a. Spiking fever - positive in Crohn's disease because of intraabdominal abscess. b. Proctitis - Rectum inflammation is a feature of Ulcerative colitis. c. Fistula formation - Positive in Crohn's disease d. Cobble stone mucosa - Positive in Crohn's disease", 'role': 'assistant'}]