Question: when did lady gaga perform at the super bowl
[{'answer': 'Super Bowl LI', 'provenance': [{'wikipedia_id': '1730307', 'title': 'List of Super Bowl halftime shows', 'start_paragraph_id': 1, 'start_character': 724, 'end_paragraph_id': 1, 'end_character': 737, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1730307', 'title': 'List of Super Bowl halftime shows', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 1171, 'bleu_score': 0.9634950607161731, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7031216845139376533}, 'section': 'Section::::Abstract.'}]}]