Question: what do they put on bulls to make them buck
[{'answer': 'the rider', 'provenance': [{'wikipedia_id': '177405', 'title': 'Bull riding', 'start_paragraph_id': 1, 'start_character': 143, 'end_paragraph_id': 1, 'end_character': 152, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '177405', 'title': 'Bull riding', 'start_paragraph_id': 11, 'start_character': 9, 'end_paragraph_id': 11, 'end_character': 279, 'bleu_score': 0.8604885811656501, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 189299162791479071}, 'section': 'Section::::Rules and regulations.\n'}]}]