Question: who coached the winner of the voice last year
[{'answer': 'Kelly Clarkson', 'provenance': [{'wikipedia_id': '56093849', 'title': 'The Voice (American season 14)', 'start_paragraph_id': 1, 'start_character': 112, 'end_paragraph_id': 1, 'end_character': 126, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '56093849', 'title': 'The Voice (American season 14)', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 594, 'bleu_score': 0.9796927878356411, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9680476367958735072}, 'section': 'Section::::Abstract.'}]}]