Question: who plays mrs thatcher on when calls the heart
[{'answer': 'Erin Krakow', 'provenance': [{'wikipedia_id': '41630866', 'title': 'When Calls the Heart', 'start_paragraph_id': 2, 'start_character': 236, 'end_paragraph_id': 2, 'end_character': 247, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '41630866', 'title': 'When Calls the Heart', 'start_paragraph_id': 11, 'start_character': 0, 'end_paragraph_id': 11, 'end_character': 54, 'bleu_score': 0.6803749333171201, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5699728780451326269}, 'section': 'Section::::Cast.:Main.\n'}]}]