This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Inflammatory bowel disease, Subject name: Surgery
String sign of Kantor seen in: 
Select and explain. 
A. Crohn's disease, B. Ulcerative colitis, C. Both of the above, D. None of the above
A: Crohn's disease
Answer: A: Crohn's disease 
Explanation: Named features of Crohn's Disease :- Hose Pipe appearance Cobble-stone appearance Halo sign on CT String sign of Kantor Raspberry/ rosethorn appearance