Question: when did the first episode of phineas and ferb come out
[{'answer': 'August 17 , 2007', 'provenance': [{'wikipedia_id': '6018749', 'title': 'Phineas and Ferb', 'start_paragraph_id': 65, 'start_character': 104, 'end_paragraph_id': 65, 'end_character': 120, 'bleu_score': 1.0, 'section': 'Section::::Reception and achievements.:Ratings.\n'}]}, {'provenance': [{'wikipedia_id': '6018749', 'title': 'Phineas and Ferb', 'start_paragraph_id': 1, 'start_character': 12, 'end_paragraph_id': 1, 'end_character': 1360, 'bleu_score': 0.7991799594191861, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4092899811544402027}, 'section': 'Section::::Abstract.'}]}]