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
[{'content': '"String sign of Kantor" is seen in \nSelect and explain. \nA. Ulcerative colitis, B. Crohn\'s disease, C. Cholecystitis, D. Appendicitis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: (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.', 'role': 'assistant'}]