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
Klatskin tumor resembles- 
Select and explain. 
A. Adenoma of liver, B. Cholangio CA, C. GB CA, D. Hepatic CA
B: Cholangio CA
Answer: B: Cholangio CA 
Explanation: Ans. is 'b' i.e., Cholangiocarcinoma o Extrahepatic adenocercinoma of bileducts, when proximal, is referred to as hilar cholangiocarcinoma (Klatskin's tumor).