This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cystic fibrosis & Sleep apnea, Subject name: Medicine
[{'content': 'What is the most common presentation in cystic fibrosis? \nSelect and explain. \nA. Lung infection, B. Meconium ileus, C. Malabsorption, D. Infeility', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 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', 'role': 'assistant'}]