Question: who starred in the greatest show on earth
[{'answer': 'Betty Hutton', 'provenance': [{'wikipedia_id': '42137', 'title': 'The Greatest Show on Earth (film)', 'start_paragraph_id': 1, 'start_character': 226, 'end_paragraph_id': 1, 'end_character': 238, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Cornel Wilde', 'provenance': [{'wikipedia_id': '42137', 'title': 'The Greatest Show on Earth (film)', 'start_paragraph_id': 1, 'start_character': 243, 'end_paragraph_id': 1, 'end_character': 255, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Charlton Heston', 'provenance': [{'wikipedia_id': '42137', 'title': 'The Greatest Show on Earth (film)', 'start_paragraph_id': 1, 'start_character': 310, 'end_paragraph_id': 1, 'end_character': 325, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'James Stewart', 'provenance': [{'wikipedia_id': '42137', 'title': 'The Greatest Show on Earth (film)', 'start_paragraph_id': 1, 'start_character': 366, 'end_paragraph_id': 1, 'end_character': 379, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '42137', 'title': 'The Greatest Show on Earth (film)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 551, 'bleu_score': 0.978375183951072, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12365460704445836848}, 'section': 'Section::::Abstract.'}]}]