Question: who is the writer of it's always sunny in philadelphia
[{'answer': 'Rob McElhenney', 'provenance': [{'wikipedia_id': '2434796', 'title': "It's Always Sunny in Philadelphia", 'start_paragraph_id': 1, 'start_character': 172, 'end_paragraph_id': 1, 'end_character': 186, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Glenn Howerton', 'provenance': [{'wikipedia_id': '2434796', 'title': "It's Always Sunny in Philadelphia", 'start_paragraph_id': 1, 'start_character': 210, 'end_paragraph_id': 1, 'end_character': 224, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Charlie Day', 'provenance': [{'wikipedia_id': '2434796', 'title': "It's Always Sunny in Philadelphia", 'start_paragraph_id': 1, 'start_character': 302, 'end_paragraph_id': 1, 'end_character': 313, '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': 0.7953411010438081, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14627911291498038001}, 'section': 'Section::::Abstract.'}]}]