This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gallstone Disease, Subject name: Surgery
[{'content': "Mirizzi's syndrome is? \nSelect and explain. \nA. Gall bladder stone compressing common hepatic duct, B. Gall bladder carcinoma invading IVC, C. Gall bladder stone causing cholecystitis, D. Pancreatic carcinoma", 'role': 'user'}, {'content': "Answer: A \nExplanation: ANSWER: (A) Gall bladder stone compressing common hepatic ductREF: Bailey and love 24th ed p. 1106Mirizzi syndrome is obstruction of biliary duct leading to jaundice due to stone impacted in Hartmann's pouch or cystic duct.", 'role': 'assistant'}]