This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gall Bladder & Bile Ducts, Subject name: Surgery
[{'content': 'Most common site of gall stone impaction in Cholecysto Intestinal fistula is \nSelect and explain. \nA. DJ junction, B. Proximal to ileo-cecal junction, C. Distal to ileo-cecal junction, D. Colon', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. (b) Proximal to ileo cecal junctionRef: Sabiston 20th edition Page 1506Gallstone ileus:* MC site of obstruction is terminal ileum* Intermittent obstruction is seen* Pneumobilia is seen* 10% have multiple stones in small intestine', 'role': 'assistant'}]