This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gallbladder Cancer, Subject name: Surgery
[{'content': 'Klatskin tumor resembles- \nSelect and explain. \nA. Adenoma of liver, B. Cholangio CA, C. GB CA, D. Hepatic CA', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Cholangiocarcinoma o Extrahepatic adenocercinoma of bileducts, when proximal, is referred to as hilar cholangiocarcinoma (Klatskin's tumor).", 'role': 'assistant'}]