Question: who plays the waitress on it's always sunny in philadelphia
[{'answer': 'Mary Elizabeth Ellis', 'provenance': [{'wikipedia_id': '20700532', 'title': 'Mary Elizabeth Ellis', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 20, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '20700532', 'title': 'Mary Elizabeth Ellis', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 364, 'bleu_score': 0.594736501264256, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 726895613290132473}, 'section': 'Section::::Abstract.'}]}]