Question: what are the three tribes that make up the sioux nation
[{'answer': 'Lakota', 'provenance': [{'wikipedia_id': '937576', 'title': 'Great Sioux Nation', 'start_paragraph_id': 1, 'start_character': 342, 'end_paragraph_id': 1, 'end_character': 348, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Western Dakota', 'provenance': [{'wikipedia_id': '937576', 'title': 'Great Sioux Nation', 'start_paragraph_id': 1, 'start_character': 350, 'end_paragraph_id': 1, 'end_character': 364, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Eastern Dakota', 'provenance': [{'wikipedia_id': '937576', 'title': 'Great Sioux Nation', 'start_paragraph_id': 1, 'start_character': 370, 'end_paragraph_id': 1, 'end_character': 384, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '937576', 'title': 'Great Sioux Nation', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 523, 'bleu_score': 0.8661549754828191, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6937434187299626110}, 'section': 'Section::::Abstract.'}]}]