Question: when was the first roller skating rink opened
[{'answer': '1857', 'provenance': [{'wikipedia_id': '228429', 'title': 'Roller skating', 'start_paragraph_id': 11, 'start_character': 12, 'end_paragraph_id': 11, 'end_character': 16, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}]