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: Medicine
In which of the following conditions pseudopolyps are seen? 
Select and explain. 
A. Crohn's disease, B. Ulcerative colitis, C. Celiac disease, D. Tropical sprue
B: Ulcerative colitis
Answer: B: Ulcerative colitis 
Explanation: Islands of regenerating mucosa called pseudopolyps can be seen in ulcerative colitis. These are seen during a quiescent phase of ulcerative colitis and are a later manifestation of this condition. Ref: Robbin's 7th edition page 851, Harrison's Internal Medicine 17th edition chapter 26 ; Colon and Rectal Surgery, 5e By Marvin L. Corman, 2005, Page 1330.