Question: who plays brenda's mom on six feet under
[{'answer': 'Joanna Cassidy', 'provenance': [{'wikipedia_id': '2301873', 'title': 'List of Six Feet Under characters', 'start_paragraph_id': 49, 'start_character': 30, 'end_paragraph_id': 49, 'end_character': 44, 'bleu_score': 1.0, 'section': 'Section::::Supporting characters.:Margaret Chenowith.\n'}]}, {'provenance': [{'wikipedia_id': '2301873', 'title': 'List of Six Feet Under characters', 'start_paragraph_id': 49, 'start_character': 0, 'end_paragraph_id': 49, 'end_character': 815, 'bleu_score': 0.9850176677359421, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15095453358773810406}, 'section': 'Section::::Supporting characters.:Margaret Chenowith.\n'}]}]