This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Small & Large Intestine, Subject name: Surgery
"String sign of Kantor" is seen in 
Select and explain. 
A. Ulcerative colitis, B. Crohn's disease, C. Cholecystitis, D. Appendicitis
B: Crohn's disease
Answer: B: Crohn's disease 
Explanation: (Crohn's disease) (1170-LB) (1171-B & L 25th)* Crohn's disease - The principal findings include thickened bowel wall with stricture ("String sign of kantor")* Rovsing's sign - A sharp pressure over the left iliac fossa produces pain in the right iliac fossa in Acute Appendicitis* Murphy's sign - The patient experiences pain and "Catches the breath" just before the zenith of respiration when the gall bladder area is gently pressed in acute cholecystitis* Boas sign - There may be an area of hyperaesthesia between the ninth and eleventh ribs posteriorly on the right side in Acute cholecystitis.