This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gastrointestinal Radiology, Subject name: Radiology
Collar button sign is associated with 
Select and explain. 
A. Ulcerative colitis, B. Hirshsprung disease, C. Plummer Vinson syndrome, D. Chiladiti syndrome
A: Ulcerative colitis
Answer: A: Ulcerative colitis 
Explanation: "Collar button ulcers" are manifestations of inflammatory processes within the bowel, seen with Ulcerative colitis.