Question: who played the mother in leave it to beaver
[{'answer': 'Billingsley', 'provenance': [{'wikipedia_id': '983771', 'title': 'Barbara Billingsley', 'start_paragraph_id': 0, 'start_character': 8, 'end_paragraph_id': 0, 'end_character': 19, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '983771', 'title': 'Barbara Billingsley', 'start_paragraph_id': 12, 'start_character': 0, 'end_paragraph_id': 12, 'end_character': 719, 'bleu_score': 0.9844346099707091, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7467674152048186954}, 'section': 'Section::::Career.:"Leave It to Beaver".\n'}]}]