Question: which tribes relied on hunting buffalo for survival
[{'answer': 'Plains Indians', 'provenance': [{'wikipedia_id': '25651214', 'title': 'Bison hunting', 'start_paragraph_id': 1, 'start_character': 153, 'end_paragraph_id': 1, 'end_character': 167, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '25651214', 'title': 'Bison hunting', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 889, 'bleu_score': 0.634012980948923, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8131940889417991236}, 'section': 'Section::::Abstract.'}]}]