Question: who played cassandra's mum in only fools and horses
[{'answer': 'Wanda Ventham', 'provenance': [{'wikipedia_id': '2504374', 'title': 'Wanda Ventham', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 13, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2504374', 'title': 'Wanda Ventham', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 344, 'bleu_score': 0.848700009614967, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6740201159562501668}, 'section': 'Section::::Abstract.'}]}]