Question: who has the most rushing yards in football
[{'answer': 'Emmitt Smith', 'provenance': [{'wikipedia_id': '8571883', 'title': 'List of National Football League career rushing yards leaders', 'start_paragraph_id': 1, 'start_character': 168, 'end_paragraph_id': 1, 'end_character': 180, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '8571883', 'title': 'List of National Football League career rushing yards leaders', 'start_paragraph_id': 7, 'start_character': 0, 'end_paragraph_id': 7, 'end_character': 522, 'bleu_score': 0.9664751240971331, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4584735226179720358}, 'section': 'Section::::Historical rushing yards leaders.\n'}]}]