Question: when did the monorail open at disney world
[{'answer': 'October 1 , 1971', 'provenance': [{'wikipedia_id': '1661169', 'title': 'Walt Disney World Monorail System', 'start_paragraph_id': 4, 'start_character': 180, 'end_paragraph_id': 4, 'end_character': 196, 'bleu_score': 1.0, 'section': 'Section::::Lines, stations, and infrastructure.\n'}]}, {'provenance': [{'wikipedia_id': '1661169', 'title': 'Walt Disney World Monorail System', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 561, 'bleu_score': 0.922050490003484, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12423094378740265608}, 'section': 'Section::::Lines, stations, and infrastructure.\n'}]}]