Question: who are the judges in britain got talent 2017
[{'answer': 'Simon Cowell', 'provenance': [{'wikipedia_id': '8517686', 'title': "Britain's Got Talent", 'start_paragraph_id': 1, 'start_character': 153, 'end_paragraph_id': 1, 'end_character': 165, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Amanda Holden', 'provenance': [{'wikipedia_id': '8517686', 'title': "Britain's Got Talent", 'start_paragraph_id': 2, 'start_character': 257, 'end_paragraph_id': 2, 'end_character': 270, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Alesha Dixon', 'provenance': [{'wikipedia_id': '8517686', 'title': "Britain's Got Talent", 'start_paragraph_id': 2, 'start_character': 272, 'end_paragraph_id': 2, 'end_character': 284, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'David Walliams', 'provenance': [{'wikipedia_id': '8517686', 'title': "Britain's Got Talent", 'start_paragraph_id': 2, 'start_character': 290, 'end_paragraph_id': 2, 'end_character': 304, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]