Question: what is the purpose of a roller coaster
[{'answer': 'amusement', 'provenance': [{'wikipedia_id': '137471', 'title': 'Roller coaster', 'start_paragraph_id': 1, 'start_character': 30, 'end_paragraph_id': 1, 'end_character': 39, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '137471', 'title': 'Roller coaster', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 799, 'bleu_score': 0.9851290761715561, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 90595503329206131}, 'section': 'Section::::Abstract.'}]}]