Question: what happened to the chicago world's fair buildings
[{'answer': 'transformed back into parkland', 'provenance': [{'wikipedia_id': '593069', 'title': 'Jackson Park (Chicago)', 'start_paragraph_id': 6, 'start_character': 577, 'end_paragraph_id': 6, 'end_character': 607, 'bleu_score': 1.0, 'section': "Section::::Site of a World's Fair.\n"}]}, {'provenance': [{'wikipedia_id': '593069', 'title': 'Jackson Park (Chicago)', 'start_paragraph_id': 6, 'start_character': 0, 'end_paragraph_id': 6, 'end_character': 675, 'bleu_score': 0.865158344451424, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15814846782123740285}, 'section': "Section::::Site of a World's Fair.\n"}]}]