<prompt> Which of the following is called as Klatskins tumorFibrolamellar hepatocelluar carcinomaHilar cholangiocarcinomaGall bladder adenocarcinomaIntrahepatic cholangiocarcinoma  <response>: Perihilar cholangiocarcinoma is also called Klatskin tumors. They occur at the bifurcation of right and left hepatic ducts. 