Question: who plays cora's mother on downton abbey
[{'answer': 'Shirley MacLaine', 'provenance': [{'wikipedia_id': '33907335', 'title': 'List of Downton Abbey characters', 'start_paragraph_id': 83, 'start_character': 27, 'end_paragraph_id': 83, 'end_character': 43, 'bleu_score': 1.0, 'section': 'Section::::The Crawley Family.:Martha Levinson.\n'}]}, {'provenance': [{'wikipedia_id': '33907335', 'title': 'List of Downton Abbey characters', 'start_paragraph_id': 83, 'start_character': 0, 'end_paragraph_id': 83, 'end_character': 1179, 'bleu_score': 0.9689287566733981, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2094456167271828092}, 'section': 'Section::::The Crawley Family.:Martha Levinson.\n'}]}]