Question: who is playing the halftime show at super bowl 2016
[{'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.'}]}, {'answer': 'Coldplay with special guest performers Beyoncé and Bruno Mars'}, {'answer': 'British rock group Coldplay with special guest performers Beyoncé and Bruno Mars'}, {'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': 2430977867500315580}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '45267196', 'title': 'Super Bowl 50 halftime show', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ['It was headlined by the British rock group Coldplay with special guest performers Beyoncé and Bruno Mars', 'It was headlined by the British rock group Coldplay with special guest performers Beyoncé and Bruno Mars, who previously had headlined the Super Bowl XLVII and Super Bowl XLVIII halftime shows, respectively.', "The Super Bowl 50 Halftime Show took place on February 7, 2016, at Levi's Stadium in Santa Clara, California as part of Super Bowl 50. It was headlined by the British rock group Coldplay with special guest performers Beyoncé and Bruno Mars", "The Super Bowl 50 Halftime Show took place on February 7, 2016, at Levi's Stadium in Santa Clara, California as part of Super Bowl 50. It was headlined by the British rock group Coldplay with special guest performers Beyoncé and Bruno Mars,"]}}]}]