Question: who is the host of america's got talent 2017
[{'answer': 'Supermodel and businesswoman Tyra Banks', 'provenance': [{'wikipedia_id': '51620827', 'title': "America's Got Talent (season 12)", 'start_paragraph_id': 1, 'start_character': 278, 'end_paragraph_id': 1, 'end_character': 317, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '51620827', 'title': "America's Got Talent (season 12)", 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 501, 'bleu_score': 0.976327165973018, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2661389313210052434}, 'section': 'Section::::Abstract.'}]}]