Question: who pitched a perfect game in the little league world series
[{'answer': 'Ángel Macías', 'provenance': [{'wikipedia_id': '28133228', 'title': '1957 Little League World Series', 'start_paragraph_id': 1, 'start_character': 289, 'end_paragraph_id': 1, 'end_character': 301, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '28133228', 'title': '1957 Little League World Series', 'start_paragraph_id': 4, 'start_character': 256, 'end_paragraph_id': 4, 'end_character': 840, 'bleu_score': 0.9788329837059241, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5858367416898618835}, 'section': 'Section::::Industrial Little League of Monterrey.\n'}]}]