Question: when did ukraine gain independence from the soviet union
[{'answer': '1917', 'provenance': [{'wikipedia_id': '84795', 'title': 'History of Ukraine', 'start_paragraph_id': 7, 'start_character': 68, 'end_paragraph_id': 7, 'end_character': 72, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]