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
Mirizzi's syndrome is? 
Select and explain. 
A. Gall bladder stone compressing common hepatic duct, B. Gall bladder carcinoma invading IVC, C. Gall bladder stone causing cholecystitis, D. Pancreatic carcinoma
A: Gall bladder stone compressing common hepatic duct
Answer: A: Gall bladder stone compressing common hepatic duct 
Explanation: 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.