Question: what is the fastest horse to win the kentucky derby
[{'answer': 'Secretariat', 'provenance': [{'wikipedia_id': '17135', 'title': 'Kentucky Derby', 'start_paragraph_id': 12, 'start_character': 79, 'end_paragraph_id': 12, 'end_character': 90, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '17135', 'title': 'Kentucky Derby', 'start_paragraph_id': 12, 'start_character': 0, 'end_paragraph_id': 12, 'end_character': 679, 'bleu_score': 0.8972537400098731, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14999803834919629481}, 'section': 'Section::::History.\n'}]}]