Question: what is the name for the russian dolls
[{'answer': 'matryoshka', 'provenance': [{'wikipedia_id': '331080', 'title': 'Matryoshka doll', 'start_paragraph_id': 1, 'start_character': 192, 'end_paragraph_id': 1, 'end_character': 202, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '331080', 'title': 'Matryoshka doll', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 316, 'bleu_score': 0.6207304132735241, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9113839905531764467}, 'section': 'Section::::Abstract.'}]}]