Card 13 / 30: A 32 year old woman undergoes a gastric bypass operation for morbid obesity. The surgery goes well and she loses 70 kg in two months. She has two children; the youngest was delivered by caesarean section 2 years ago. She comes into the emergency room complaining of intermittent episodes of right upper quadrant abdominal pain. The physical exam is remarkable for right upper quadrant tenderness. Liver function studies are normal. A right upper quadrant ultrasound shows numerous mobile structures with acoustic shadowing in the gallbladder. The bile duct is not dilated. The most likely risk factor for this patient’s condition is which of the following?
A) Recent pregnancy
B) Rapid weight loss
C) Age
D) High serum cholesterol
E) High cholesterol diet

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