Question: who played mother on little house on the prairie
[{'answer': 'Karen Trust Grassle', 'provenance': [{'wikipedia_id': '1811286', 'title': 'Karen Grassle', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 19, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1811286', 'title': 'Karen Grassle', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 286, 'bleu_score': 0.908198718008664, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 889970733355127609}, 'section': 'Section::::Abstract.'}]}]