This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Anatomy
[{'content': 'Treatment of gallstone ileus is \nSelect and explain. \nA. Cholecystectomy, B. Removal of obstruction, C. Cholecystectomy, closure of fistula and removal of stone by enterotomy, D. Cholecystectomy with closure of fistula', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Treatment of gallstone ileus It is a surgical emergency without a period of waiting in the hope that stone will pass In case of obstruction in the ileum calculus can be manipulated proximally to a healthy jejunum where a safe enterotomy and stone removal may be executed Ref:Sabiston 20th edition Pgno :1506-1507', 'role': 'assistant'}]