Question: who won last year america's got talent
[{'answer': 'Grace Avery VanderWaal', 'provenance': [{'wikipedia_id': '51604371', 'title': 'Grace VanderWaal', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 22, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]