This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Small intestine, Subject name: Surgery
[{'content': "Kalu, 35-year old male presented with the history of recurrent attacks of colicky abdominal pain. Barium meal follow through was done. What is the name of this radiological sign? \nSelect and explain. \nA. String sign of Kantor, B. Goose neck appearance, C. Fleishner's sign, D. Umbrella sign", 'role': 'user'}, {'content': 'Answer: A \nExplanation: On Barium meal follow throughIn GI TB -contraction of mesocolon 1. Pulled - up cecum 2. Obtuse I/C Angle 3. Goose Neck Deformity - Rapid uptake of barium into colon due to Formation of Transverse ulcers in ileum which causes hyper irritability- Narrowed appearance of ileum aka "STERLEIN SIGN".- Persistent narrowing due to strictures - STRING SIGN OF KANTOR- Sterlein sign & string sign of Kantor - are seen in GITB, as well as Crohn\'s disease.- In chronic cases, thickened IC valve, rigid cecum, narrowed ileum is known as UMBRELLA SIGN/ FLIESHER\'S SIGN', 'role': 'assistant'}]