Question: what is the function of bronchi in respiratory system
[{'answer': 'deliver oxygen', 'provenance': [{'wikipedia_id': '308449', 'title': 'Bronchus', 'start_paragraph_id': 5, 'start_character': 262, 'end_paragraph_id': 5, 'end_character': 276, 'bleu_score': 1.0, 'section': 'Section::::Structure.\n'}]}, {'provenance': [{'wikipedia_id': '308449', 'title': 'Bronchus', 'start_paragraph_id': 5, 'start_character': 0, 'end_paragraph_id': 5, 'end_character': 844, 'bleu_score': 0.9861583350689591, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11838986420513770219}, 'section': 'Section::::Structure.\n'}]}]