Question: who plays sister bernadette in call the midwife
[{'answer': 'Laura Main', 'provenance': [{'wikipedia_id': '38716339', 'title': 'Laura Main', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 10, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '38716339', 'title': 'Laura Main', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 156, 'bleu_score': 0.78981801323022, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9972361822801893929}, 'section': 'Section::::Abstract.'}]}]