Question: how long is a quarter in a nfl football game
[{'answer': '15 minutes', 'provenance': [{'wikipedia_id': '18951490', 'title': 'American football', 'start_paragraph_id': 54, 'start_character': 146, 'end_paragraph_id': 54, 'end_character': 156, 'bleu_score': 1.0, 'section': 'Section::::Rules.:Duration and time stoppages.\n'}]}, {'provenance': [{'wikipedia_id': '18951490', 'title': 'American football', 'start_paragraph_id': 54, 'start_character': 0, 'end_paragraph_id': 54, 'end_character': 1281, 'bleu_score': 0.991543150574237, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14945981722138968315}, 'section': 'Section::::Rules.:Duration and time stoppages.\n'}]}]