Question: who plays the voice of isabella on phineas and ferb
[{'answer': 'Alyson Stoner', 'provenance': [{'wikipedia_id': '22388597', 'title': 'List of Phineas and Ferb characters', 'start_paragraph_id': 38, 'start_character': 35, 'end_paragraph_id': 38, 'end_character': 48, 'bleu_score': 1.0, 'section': 'Section::::Secondary characters.:Isabella Garcia-Shapiro.\n'}]}, {'provenance': [{'wikipedia_id': '22388597', 'title': 'List of Phineas and Ferb characters', 'start_paragraph_id': 38, 'start_character': 0, 'end_paragraph_id': 38, 'end_character': 466, 'bleu_score': 0.976327165973018, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8263783275239905474}, 'section': 'Section::::Secondary characters.:Isabella Garcia-Shapiro.\n'}]}]