Question: when did the bolshevik revolution start and end
[{'answer': '7 November 1917', 'provenance': [{'wikipedia_id': '25762', 'title': 'Russian Revolution', 'start_paragraph_id': 64, 'start_character': 43, 'end_paragraph_id': 64, 'end_character': 58, 'bleu_score': 1.0, 'section': 'Section::::October Revolution.\n'}]}]