Question: who was the winner of america's got talent last year
[{'answer': 'Grace VanderWaal', 'provenance': [{'wikipedia_id': '47508607', 'title': "America's Got Talent (season 11)", 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 16, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '47508607', 'title': "America's Got Talent (season 11)", 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 359, 'bleu_score': 0.9250392488272071, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1051166255220215307}, 'section': 'Section::::Abstract.'}]}]