Question: who rode american pharoah in the kentucky derby
[{'answer': 'Victor Espinoza', 'provenance': [{'wikipedia_id': '9631181', 'title': 'Victor Espinoza', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 15, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '9631181', 'title': 'Victor Espinoza', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 647, 'bleu_score': 0.9056398061425991, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16961162765089722668}, 'section': 'Section::::Abstract.'}]}]