Question: when did it's always sunny in philadelphia first air
[{'answer': 'August 4 , 2005', 'provenance': [{'wikipedia_id': '2434796', 'title': "It's Always Sunny in Philadelphia", 'start_paragraph_id': 1, 'start_character': 80, 'end_paragraph_id': 1, 'end_character': 95, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2434796', 'title': "It's Always Sunny in Philadelphia", 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 509, 'bleu_score': 0.8015579302540261, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16568255091058025026}, 'section': 'Section::::Abstract.'}]}]