Question: who plays barney's sister on how i met your mother
[{'answer': 'Ashley Benson', 'provenance': [{'wikipedia_id': '27412358', 'title': 'Barney Stinson', 'start_paragraph_id': 18, 'start_character': 259, 'end_paragraph_id': 18, 'end_character': 272, 'bleu_score': 1.0, 'section': 'Section::::Character.:Childhood and family.\n'}]}, {'provenance': [{'wikipedia_id': '27412358', 'title': 'Barney Stinson', 'start_paragraph_id': 18, 'start_character': 0, 'end_paragraph_id': 18, 'end_character': 545, 'bleu_score': 0.8883415126676231, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3038189846929649044}, 'section': 'Section::::Character.:Childhood and family.\n'}]}]