Question: who won the triple crown before american pharaoh
[{'answer': 'Affirmed', 'provenance': [{'wikipedia_id': '45099648', 'title': 'American Pharoah', 'start_paragraph_id': 3, 'start_character': 292, 'end_paragraph_id': 3, 'end_character': 300, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '45099648', 'title': 'American Pharoah', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 1149, 'bleu_score': 0.9447090450798751, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12870561241991784903}, 'section': 'Section::::Abstract.'}]}]