This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pancreas, Subject name: Surgery
[{'content': 'A 67-year-old woman is evaluated for obstructive jaundice. The cholangiographic findings indicate that she has a cancer of the lower end of the CBD. Clinical examination would most likely reveal which of the following? \nSelect and explain. \nA. Enlarged gallbladder, B. Shrunken gallbladder, C. Enlarged pancreas, D. Shrunken pancreas', 'role': 'user'}, {'content': "Answer: A \nExplanation: The gallbladder is enlarged (Courvoisier's sign) in most cases of obstructive jaundice attributable to malignancy. In obstructive jaundice attributable to gallstones, the gallbladder is usually shrunken, owing to the previous inflammatory condition affecting the gallbladder.", 'role': 'assistant'}]