<prompt> Marker for biliary tract obstruction -Alkaline phosphataseAspaate transaminaseAlanine transaminaseCreatinine kinase  <response>: Answer-A. Alkaline phosphataseEnzymes that reflect cholestasisAlkaline phosphatase5- nucleotidaseGamma-glutamyl transpeptidase GGTLipoprotein-X is an abnormal lipoprotein that appears in the sera of patients with obstructive jaundice and thus is a sensitive indicator of cholestasis. 