Question: name of a russian sled pulled by three horses
[{'answer': 'troika', 'provenance': [{'wikipedia_id': '25210190', 'title': 'Troika (driving)', 'start_paragraph_id': 1, 'start_character': 2, 'end_paragraph_id': 1, 'end_character': 8, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '25210190', 'title': 'Troika (driving)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 647, 'bleu_score': 0.953228079898853, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7593301547552798169}, 'section': 'Section::::Abstract.'}]}]