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: Medicine
Whichof the following signs is seen in Crohn's disease? 
Select and explain. 
A. String sign of Kantor, B. Strought's sign, C. Pincer sign, D. Inveed 3 sign
A: String sign of Kantor
Answer: A: String sign of Kantor 
Explanation: The term "string sign" may be applied to other narrowed loops of small bowel in Crohn's disease. Carcinoid tumors may produce similar findings in the ileum and "string sign" may be seen in an elongated and narrowed pylorus caused by hyperophic pyloric stenosis.