Question: who performed in super bowl 51 halftime show
[{'answer': 'Lady Gaga', 'provenance': [{'wikipedia_id': '45280343', 'title': 'Super Bowl LI halftime show', 'start_paragraph_id': 1, 'start_character': 123, 'end_paragraph_id': 1, 'end_character': 132, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '45280343', 'title': 'Super Bowl LI halftime show', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 253, 'bleu_score': 0.68365988062297, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7866768751877677135}, 'section': 'Section::::Abstract.'}]}]