Question: who did the first double backflip on a dirt bike
[{'answer': 'Travis Pastrana', 'provenance': [{'wikipedia_id': '4699574', 'title': 'Freestyle motocross', 'start_paragraph_id': 8, 'start_character': 321, 'end_paragraph_id': 8, 'end_character': 336, 'bleu_score': 1.0, 'section': 'Section::::Evolution of the backflip.\n'}]}, {'provenance': [{'wikipedia_id': '4699574', 'title': 'Freestyle motocross', 'start_paragraph_id': 16, 'start_character': 0, 'end_paragraph_id': 16, 'end_character': 362, 'bleu_score': 0.9679895851501501, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5981719551420274235}, 'section': 'Section::::Evolution of the backflip.\n'}]}]