Question: who was in super bowl 50 halftime show
[{'answer': 'Coldplay', 'provenance': [{'wikipedia_id': '45267196', 'title': 'Super Bowl 50 halftime show', 'start_paragraph_id': 1, 'start_character': 178, 'end_paragraph_id': 1, 'end_character': 186, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Beyoncé', 'provenance': [{'wikipedia_id': '45267196', 'title': 'Super Bowl 50 halftime show', 'start_paragraph_id': 1, 'start_character': 217, 'end_paragraph_id': 1, 'end_character': 224, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Bruno Mars', 'provenance': [{'wikipedia_id': '45267196', 'title': 'Super Bowl 50 halftime show', 'start_paragraph_id': 1, 'start_character': 229, 'end_paragraph_id': 1, 'end_character': 239, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '45267196', 'title': 'Super Bowl 50 halftime show', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 341, 'bleu_score': 0.9657992495762461, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17013940720163909105}, 'section': 'Section::::Abstract.'}]}]