Question: who have been the hosts of the price is right
[{'answer': 'Bill Cullen', 'provenance': [{'wikipedia_id': '5909850', 'title': 'The Price Is Right', 'start_paragraph_id': 1, 'start_character': 424, 'end_paragraph_id': 1, 'end_character': 435, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Bob Barker', 'provenance': [{'wikipedia_id': '5909850', 'title': 'The Price Is Right', 'start_paragraph_id': 1, 'start_character': 500, 'end_paragraph_id': 1, 'end_character': 510, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Drew Carey', 'provenance': [{'wikipedia_id': '5909850', 'title': 'The Price Is Right', 'start_paragraph_id': 1, 'start_character': 524, 'end_paragraph_id': 1, 'end_character': 534, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '5909850', 'title': 'The Price Is Right', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 557, 'bleu_score': 0.9606438885644071, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4869485965828862268}, 'section': 'Section::::Abstract.'}]}]