Question: who is the greatest horse that ever lived
[{'answer': 'Secretariat', 'provenance': [{'wikipedia_id': '62400', 'title': 'Secretariat (horse)', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 11, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '62400', 'title': 'Secretariat (horse)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 670, 'bleu_score': 0.8594366022269101, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4584269041339820787}, 'section': 'Section::::Abstract.'}]}]