Question: the name given to the noble class of russia is
[{'answer': 'dvoryanstvo', 'provenance': [{'wikipedia_id': '1105607', 'title': 'Russian nobility', 'start_paragraph_id': 1, 'start_character': 24, 'end_paragraph_id': 1, 'end_character': 35, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]