Question: who played stella in how i met your mother
[{'answer': 'Sarah Chalke', 'provenance': [{'wikipedia_id': '716155', 'title': 'Sarah Chalke', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 12, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '716155', 'title': 'Sarah Chalke', 'start_paragraph_id': 1, 'start_character': 13, 'end_paragraph_id': 1, 'end_character': 473, 'bleu_score': 0.806987041120329, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13321016568547684489}, 'section': 'Section::::Abstract.'}]}]