Question: who played claire huxtable's mother on the cosby show
[{'answer': 'Ethel Ayler', 'provenance': [{'wikipedia_id': '11567670', 'title': 'List of The Cosby Show characters', 'start_paragraph_id': 82, 'start_character': 28, 'end_paragraph_id': 82, 'end_character': 39, 'bleu_score': 1.0, 'section': 'Section::::Recurring characters.\n'}]}, {'provenance': [{'wikipedia_id': '11567670', 'title': 'List of The Cosby Show characters', 'start_paragraph_id': 82, 'start_character': 0, 'end_paragraph_id': 82, 'end_character': 67, 'bleu_score': 0.7860753021519781, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17794001493465266392}, 'section': 'Section::::Recurring characters.\n'}]}]