Question: who is hosting america's got talent in 2017
[{'answer': 'Tyra Banks', 'provenance': [{'wikipedia_id': '4829129', 'title': "America's Got Talent", 'start_paragraph_id': 20, 'start_character': 881, 'end_paragraph_id': 20, 'end_character': 891, 'bleu_score': 1.0, 'section': 'Section::::Judges and hosts.\n'}]}]