Question: who played karen in how i met your mother
[{'answer': 'Prepon', 'provenance': [{'wikipedia_id': '753300', 'title': 'Laura Prepon', 'start_paragraph_id': 0, 'start_character': 6, 'end_paragraph_id': 0, 'end_character': 12, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '753300', 'title': 'Laura Prepon', 'start_paragraph_id': 11, 'start_character': 0, 'end_paragraph_id': 11, 'end_character': 1508, 'bleu_score': 0.964079850158121, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 82208025813606380}, 'section': 'Section::::Career.:2005–2010.\n'}]}]