Question: who played sissy spacek's mother in carrie
[{'answer': 'Piper Laurie', 'provenance': [{'wikipedia_id': '4899791', 'title': 'Carrie (1976 film)', 'start_paragraph_id': 1, 'start_character': 406, 'end_paragraph_id': 1, 'end_character': 418, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]