Question: in what area of the lung does respiration occur
[{'answer': 'microscopic alveoli'}, {'provenance': [{'wikipedia_id': '36863', 'title': 'Lung', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 1502, 'bleu_score': 0.86405817011642, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7301534255774434205}, 'section': 'Section::::Abstract.'}]}]