Question: when did the metropolitan museum of art open
[{'answer': 'February 20 , 1872', 'provenance': [{'wikipedia_id': '37535', 'title': 'Metropolitan Museum of Art', 'start_paragraph_id': 74, 'start_character': 27, 'end_paragraph_id': 74, 'end_character': 45, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '37535', 'title': 'Metropolitan Museum of Art', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 221, 'bleu_score': 0.950578622812921, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6183627316805882234}, 'section': 'Section::::Abstract.'}]}]