<prompt> What is the most common presentation in cystic fibrosis?Lung infectionMeconium ileusMalabsorptionInfeility  <response>: Feature Percentage of cases Acute or persistent respiratory symptoms 50.5 Failure to thrive, malnutrition 42.9 Abnormal stools 35.0 Meconium ileus, intestinal obstruction 18.8 Family history 16.8 Electrolyte acid-base abnormality 5.4 Nasal polyps; sinus disease 2.0 Hepatobiliary disease 0.9 