Question: when did west virginia split off from virginia
[{'answer': '1863', 'provenance': [{'wikipedia_id': '2812356', 'title': 'History of West Virginia', 'start_paragraph_id': 1, 'start_character': 299, 'end_paragraph_id': 1, 'end_character': 303, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2812356', 'title': 'History of West Virginia', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 540, 'bleu_score': 0.8679057438321011, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13898222858163953918}, 'section': 'Section::::Abstract.'}]}]