Question: when did pirates of the caribbean open at disney world
[{'answer': 'December 15 , 1973', 'provenance': [{'wikipedia_id': '288052', 'title': 'Pirates of the Caribbean (attraction)', 'start_paragraph_id': 7, 'start_character': 491, 'end_paragraph_id': 7, 'end_character': 509, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}]