This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pathology
[{'content': "Pseudopolyps are features of - \nSelect and explain. \nA. Crohn's disease, B. Ulcerative colitis, C. Celiac sprue, D. Whipple's disease", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ulcerative colitis \n\nUlcerative colitis is an inflammatory bowel disease characterized by -\n\n\nInflammation involving only the mucosa and submucosa.\nFormation of pseudopolyps\nInvolvement is in a continuous fashion (absent of skip lesions which are characteristic of CD).\n\n\nUlcerative colitis involves the rectum and extends proximally in a retrograde fashion to involve the entire colon (pancolitis) in more severe cases.\nUC is associated with HLA-DR2, polymorphism in IL-10 gene and an abnormal T-cell response particularly of CD4 T-cells (T H2 cells).', 'role': 'assistant'}]