Question: who does ariel winter voice on phineas and ferb
[{'answer': 'Gretchen', 'provenance': [{'wikipedia_id': '17349106', 'title': 'Ariel Winter', 'start_paragraph_id': 6, 'start_character': 376, 'end_paragraph_id': 6, 'end_character': 384, 'bleu_score': 1.0, 'section': 'Section::::Career.\n'}]}, {'provenance': [{'wikipedia_id': '17349106', 'title': 'Ariel Winter', 'start_paragraph_id': 6, 'start_character': 0, 'end_paragraph_id': 6, 'end_character': 1032, 'bleu_score': 0.9669408728499951, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 30196872062655659}, 'section': 'Section::::Career.\n'}]}]