Question: what is the longest race track in the world
[{'answer': 'Self - Transcendence 3100 mile', 'provenance': [{'wikipedia_id': '4104073', 'title': 'Self-Transcendence 3100 Mile Race', 'start_paragraph_id': 5, 'start_character': 4, 'end_paragraph_id': 5, 'end_character': 36, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '4104073', 'title': 'Self-Transcendence 3100 Mile Race', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 261, 'bleu_score': 0.8832000938217641, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1769310161289580791}, 'section': 'Section::::Abstract.'}]}]