Question: how old was secretariat when he was put down
[{'answer': '19', 'provenance': [{'wikipedia_id': '62400', 'title': 'Secretariat (horse)', 'start_paragraph_id': 1, 'start_character': 23, 'end_paragraph_id': 1, 'end_character': 25, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]