Question: who is the girl that sings with the chainsmokers
[{'answer': 'Halsey', 'provenance': [{'wikipedia_id': '51201402', 'title': 'Closer (The Chainsmokers song)', 'start_paragraph_id': 1, 'start_character': 82, 'end_paragraph_id': 1, 'end_character': 88, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '51201402', 'title': 'Closer (The Chainsmokers song)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 496, 'bleu_score': 0.866997891095569, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15504163773277836055}, 'section': 'Section::::Abstract.'}]}]