<prompt> A child is brought to the paediatric OPD with fever of 24 hours duration. History reveals 3 episodes of chest infection and passage of foul smelling stools. The most probable diagnosis isCystic FibrosisMaple Syrup urine DiseaseBilirubin Congugation DefectCriggler Najar Syndrome  <response>: Recurrent chest infection in a child with evidence of exocrine pancreatic insufficiency bulky, foul smelling stool suggest a diagnosis of cystic fibrosis. 