Question: when was the last time somebody won the triple crown
[{'answer': '2015', 'provenance': [{'wikipedia_id': '19116721', 'title': 'Triple Crown of Thoroughbred Racing (United States)', 'start_paragraph_id': 3, 'start_character': 292, 'end_paragraph_id': 3, 'end_character': 296, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '19116721', 'title': 'Triple Crown of Thoroughbred Racing (United States)', 'start_paragraph_id': 3, 'start_character': 18, 'end_paragraph_id': 3, 'end_character': 302, 'bleu_score': 0.75640994636311, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14959124107987174116}, 'section': 'Section::::Abstract.'}]}]