Question: who played mrs thornton in north and south
[{'answer': 'Sinéad Cusack', 'provenance': [{'wikipedia_id': '4630722', 'title': 'North & South (TV serial)', 'start_paragraph_id': 5, 'start_character': 691, 'end_paragraph_id': 5, 'end_character': 704, 'bleu_score': 1.0, 'section': 'Section::::Plot.\n'}]}, {'provenance': [{'wikipedia_id': '4630722', 'title': 'North & South (TV serial)', 'start_paragraph_id': 18, 'start_character': 0, 'end_paragraph_id': 18, 'end_character': 47, 'bleu_score': 0.6147881529512641, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3568494018988171182}, 'section': 'Section::::Cast.\n'}]}]