Question: what is the most common element in our air
[{'answer': 'nitrogen', 'provenance': [{'wikipedia_id': '392828', 'title': 'Abundance of the chemical elements', 'start_paragraph_id': 4, 'start_character': 258, 'end_paragraph_id': 4, 'end_character': 266, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '392828', 'title': 'Abundance of the chemical elements', 'start_paragraph_id': 51, 'start_character': 0, 'end_paragraph_id': 51, 'end_character': 422, 'bleu_score': 0.9679895851501501, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8148062213738744383}, 'section': 'Section::::Earth.:Atmosphere.\n'}]}]