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: Surgery
[{'content': '42 year old obese patient comes with gallstones. She is on cholesterol lowering drugs and her weight is reduced 10 kgs in the last month. What might be the cause for gallstones \nSelect and explain. \nA. Obesity, B. Cholesterol lowering drugs, C. Rapid weight loss, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Risk factors for gallstones include-\n\nObesity\nRapid weight loss\nHemolytic disorders\nCholesterol lowering drugs\nPregnancy\nHigh carbohydrate and lipid diet\n\nCholesterol lowering drugs reduce the cholesterol in the blood but secretion of cholesterol into bile is increased. Show they cause gallstones.', 'role': 'assistant'}]