This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Anatomy
[{'content': "Type II Mirizzi's syndrome \nSelect and explain. \nA. Obstruction of common duct by external compression only(no erosion), B. Erosion of one-thirds circumference of common duct, C. Erosion of upto two-third circumference of common duct, D. Total /near total circumferential of common duct", 'role': 'user'}, {'content': "Answer: B \nExplanation: Classification of Mirizzi's Syndrome (Csendes classification) Type I Obstruction of common duct by external compression only(no erosion) Type II Erosion of less than one-third circumference of common duct Type III Erosion of upto two-third circumference of common duct Type IV Total/near total circumferential destruction of common duct Type V Erosion of GB in common duct with cholecystoenteric fistula Ref: Sabiston 20th edition Pgno :1520", 'role': 'assistant'}]