Question: when was a doll's house first performed
[{'answer': '21 December 1879', 'provenance': [{'wikipedia_id': '3144', 'title': "A Doll's House", 'start_paragraph_id': 1, 'start_character': 168, 'end_paragraph_id': 1, 'end_character': 184, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '3144', 'title': "A Doll's House", 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 274, 'bleu_score': 0.842339300412933, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14510189207256282219}, 'section': 'Section::::Abstract.'}]}]