Question: when was ain't i a woman written
[{'answer': 'June 21 , 1851', 'provenance': [{'wikipedia_id': '1941240', 'title': "Ain't I a Woman?", 'start_paragraph_id': 11, 'start_character': 115, 'end_paragraph_id': 11, 'end_character': 129, 'bleu_score': 1.0, 'section': 'Section::::The speech.:1851 version by Robinson.\n'}]}, {'provenance': [{'wikipedia_id': '1941240', 'title': "Ain't I a Woman?", 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 468, 'bleu_score': 0.942340155314736, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 18348891415713444775}, 'section': 'Section::::Abstract.'}]}]