Question: when was 500 and 1000 rupee notes banned in india
[{'answer': '8 November 2016', 'provenance': [{'wikipedia_id': '52224033', 'title': '2016 Indian banknote demonetisation', 'start_paragraph_id': 1, 'start_character': 3, 'end_paragraph_id': 1, 'end_character': 18, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]