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
Gall bladder enlargement occurs in: 
Select and explain. 
A. Carcinoma of pancreas, B. Hepatic cirrhosis, C. Chronic hepatitis, D. Chronic cholelithiasis
A: Carcinoma of pancreas
Answer: A: Carcinoma of pancreas 
Explanation: None