<prompt> The gold standard for the definitive diagnosis of the extrahepatic biliary atresia isPer operative cholangiographyHepatobiliary scintigraphyAlkaline phosphatase levelLiver biopsy  <response>: Biliary atresia Evaluation of biliary anatomy begins with ultrasound Other imaging modalities such as HIDA scintigraphy, MRCP and ERCP have been used with varying success Although these are useful adjuncts, liver biopsy is gold standard for the diagnosis of biliary atresia and can safely be done percutaneously under local anaesthesia Ref: Sabiston 20th edition Pgno : 639 