Question: who plays sister winifred in call the midwife
[{'answer': 'Victoria Natalie Yeates', 'provenance': [{'wikipedia_id': '45621576', 'title': 'Victoria Yeates', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 23, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '45621576', 'title': 'Victoria Yeates', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 195, 'bleu_score': 0.692310116290579, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12368611293135111729}, 'section': 'Section::::Abstract.'}]}]