This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous (Small & Large Intestine), Subject name: Surgery
Collar Button Ulcer is a feature of - 
Select and explain. 
A. Crohn's Disease, B. Ischaemic Colitis, C. SigmoidVolvulus, D. Ulcerative colitis
D: Ulcerative colitis
Answer: D: Ulcerative colitis 
Explanation: Ans. is 'd' i.e., Ulcerative colitis o Repeat from previous sessions