Question: what is the importance of surfactant in the lungs
[{'answer': 'To increase pulmonary compliance', 'provenance': [{'wikipedia_id': '2020401', 'title': 'Pulmonary surfactant', 'start_paragraph_id': 4, 'start_character': 12, 'end_paragraph_id': 4, 'end_character': 44, 'bleu_score': 1.0, 'section': 'Section::::Function.\n'}]}, {'answer': 'To facilitate recruitment of collapsed airways'}, {'answer': 'To prevent atelectasis ( collapse of the lung ) at the end of expiration'}]