Question: when did the west virginia teacher strike start
[{'answer': 'February 22 , 2018', 'provenance': [{'wikipedia_id': '56666538', 'title': "2018 West Virginia teachers' strike", 'start_paragraph_id': 1, 'start_character': 65, 'end_paragraph_id': 1, 'end_character': 87, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '56666538', 'title': "2018 West Virginia teachers' strike", 'start_paragraph_id': 1, 'start_character': 49, 'end_paragraph_id': 1, 'end_character': 608, 'bleu_score': 0.8877642434202531, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7357289463243126194}, 'section': 'Section::::Abstract.'}]}]