Question: when did right to buy council house start
[{'answer': '1980', 'provenance': [{'wikipedia_id': '2063383', 'title': 'Right to Buy', 'start_paragraph_id': 1, 'start_character': 535, 'end_paragraph_id': 1, 'end_character': 539, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2063383', 'title': 'Right to Buy', 'start_paragraph_id': 8, 'start_character': 0, 'end_paragraph_id': 8, 'end_character': 673, 'bleu_score': 0.9825310706027971, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 18355156022912568899}, 'section': 'Section::::History.:Thatcher policies.\n'}]}]