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: Surgery
Thumb printing is characteristic of - 
Select and explain. 
A. Crohn' s disease, B. Ischemic colitis, C. LGV, D. Ulcerative colitis
B: Ischemic colitis
Answer: B: Ischemic colitis 
Explanation: None