Question: who has been judges on america's got talent
[{'answer': 'Piers Morgan', 'provenance': [{'wikipedia_id': '4829129', 'title': "America's Got Talent", 'start_paragraph_id': 19, 'start_character': 101, 'end_paragraph_id': 19, 'end_character': 113, 'bleu_score': 1.0, 'section': 'Section::::Judges and hosts.\n'}]}, {'answer': 'Howard Stern', 'provenance': [{'wikipedia_id': '4829129', 'title': "America's Got Talent", 'start_paragraph_id': 19, 'start_character': 857, 'end_paragraph_id': 19, 'end_character': 869, 'bleu_score': 1.0, 'section': 'Section::::Judges and hosts.\n'}]}, {'answer': 'Howie Mandel', 'provenance': [{'wikipedia_id': '4829129', 'title': "America's Got Talent", 'start_paragraph_id': 2, 'start_character': 397, 'end_paragraph_id': 2, 'end_character': 409, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Brandy', 'provenance': [{'wikipedia_id': '4829129', 'title': "America's Got Talent", 'start_paragraph_id': 19, 'start_character': 81, 'end_paragraph_id': 19, 'end_character': 87, 'bleu_score': 1.0, 'section': 'Section::::Judges and hosts.\n'}]}, {'answer': 'Sharon Osbourne', 'provenance': [{'wikipedia_id': '4829129', 'title': "America's Got Talent", 'start_paragraph_id': 19, 'start_character': 307, 'end_paragraph_id': 19, 'end_character': 322, 'bleu_score': 1.0, 'section': 'Section::::Judges and hosts.\n'}]}, {'answer': 'Heidi Klum', 'provenance': [{'wikipedia_id': '4829129', 'title': "America's Got Talent", 'start_paragraph_id': 20, 'start_character': 418, 'end_paragraph_id': 20, 'end_character': 428, 'bleu_score': 1.0, 'section': 'Section::::Judges and hosts.\n'}]}, {'answer': 'Mel B', 'provenance': [{'wikipedia_id': '4829129', 'title': "America's Got Talent", 'start_paragraph_id': 20, 'start_character': 134, 'end_paragraph_id': 20, 'end_character': 139, 'bleu_score': 1.0, 'section': 'Section::::Judges and hosts.\n'}]}, {'answer': 'David Hasselhoff', 'provenance': [{'wikipedia_id': '4829129', 'title': "America's Got Talent", 'start_paragraph_id': 19, 'start_character': 63, 'end_paragraph_id': 19, 'end_character': 79, 'bleu_score': 1.0, 'section': 'Section::::Judges and hosts.\n'}]}, {'answer': 'Simon Cowell', 'provenance': [{'wikipedia_id': '4829129', 'title': "America's Got Talent", 'start_paragraph_id': 1, 'start_character': 157, 'end_paragraph_id': 1, 'end_character': 169, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]