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: Surgery
[{'content': 'The classification of mirizzi syndrome is: \nSelect and explain. \nA. Csendes, B. Todani, C. BCLC, D. Sieve', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Classification of Mirizzi syndrome: Csendes and Mc Sherry Type I: External compression of the common duct because of a stone impacted at the neck of the gallbladder or at the cystic duct. Type II: Cholecysto Biliary fistula involving less than one-third of the circumference of the common duct Type III: Cholecysto Biliary fistula that involves up to two-thirds of its circumference cholecysto biliary fistula Type IV: Cholecysto Biliary fistula with complete destruction of the entire wall of the common duct Ref: Turk J Gastroenterol 2008; 19 (4): 258-263.', 'role': 'assistant'}]