Question: when did winning colors win the kentucky derby
[{'answer': '1988', 'provenance': [{'wikipedia_id': '8162318', 'title': 'Winning Colors (horse)', 'start_paragraph_id': 8, 'start_character': 11, 'end_paragraph_id': 8, 'end_character': 15, 'bleu_score': 1.0, 'section': 'Section::::Racing career.:1987: two-year-old season.\n'}]}, {'provenance': [{'wikipedia_id': '8162318', 'title': 'Winning Colors (horse)', 'start_paragraph_id': 9, 'start_character': 0, 'end_paragraph_id': 9, 'end_character': 451, 'bleu_score': 0.9143313961023831, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14185111464265624206}, 'section': 'Section::::Racing career.:1988: three-year-old season.\n'}]}]