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: Medicine
[{'content': 'Gall bladder enlargement occurs in: \nSelect and explain. \nA. Carcinoma of pancreas, B. Hepatic cirrhosis, C. Chronic hepatitis, D. Chronic cholelithiasis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]