Question: what is the biggest nfl football stadium in the us
[{'answer': 'AT&T Stadium', 'provenance': [{'wikipedia_id': '10814816', 'title': 'List of current National Football League stadiums', 'start_paragraph_id': 9, 'start_character': 49, 'end_paragraph_id': 9, 'end_character': 61, 'bleu_score': 1.0, 'section': 'Section::::Stadium characteristics.:Seating.\n'}]}, {'provenance': [{'wikipedia_id': '10814816', 'title': 'List of current National Football League stadiums', 'start_paragraph_id': 9, 'start_character': 0, 'end_paragraph_id': 9, 'end_character': 478, 'bleu_score': 0.830649772373041, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16945140967575418596}, 'section': 'Section::::Stadium characteristics.:Seating.\n'}]}]