Question: the world fastest roller coaster is in which country
[{'answer': 'United Arab Emirates', 'provenance': [{'wikipedia_id': '24812976', 'title': 'Formula Rossa', 'start_paragraph_id': 1, 'start_character': 105, 'end_paragraph_id': 1, 'end_character': 125, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '24812976', 'title': 'Formula Rossa', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 223, 'bleu_score': 0.8351687327897671, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8625168773129506535}, 'section': 'Section::::Abstract.'}]}]