Question: in what year did the russian revolution draw to a close
[{'answer': '1917', 'provenance': [{'wikipedia_id': '137840', 'title': 'Great Purge', 'start_paragraph_id': 53, 'start_character': 104, 'end_paragraph_id': 53, 'end_character': 108, 'bleu_score': 1.0, 'section': 'Section::::The wider purge.\n'}]}, {'provenance': [{'wikipedia_id': '137840', 'title': 'Great Purge', 'start_paragraph_id': 53, 'start_character': 0, 'end_paragraph_id': 53, 'end_character': 729, 'bleu_score': 0.983672097934538, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3842766511739518064}, 'section': 'Section::::The wider purge.\n'}]}]