<prompt> Which of these is the most important cause of cholestatic jaundice in a newborn?Hypoplasia of the biliary tractCholedochal cystNeonatal hepatitisPhysiological jaundice  <response>: Ans. C. Neonatal hepatitisCholestatic jaundice is characterized predominantly by rise in the levels of conjugated bilirubin. It is due to obstruction to the bile flow, either occurring inside the live intrahepatic cholestasis or outside the liver extrahepatic cholestasis. Overall, the most common cause of cholestasis is neonatal hepatitis. The most common extrahepatic cause is biliary atresia. 