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': 'Not true of Gall stones \nSelect and explain. \nA. Biliary fistula is a complication gall stone, B. More common in female, C. Clofibrate therapy is a predisposing factor, D. Ileal resection has no effect on gall stone formation', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. (d) Ileal resection has no effect on gall stone formationRef: Sabiston 20th edition Page 1492 Gall stones:* Cholesterol stones are common in Ileal resection and in cases of Crohn's disease due to decreased Entero hepatic circulation and decreased Bile salts.", 'role': 'assistant'}]