Question: when did britain go back on the gold standard
[{'answer': '1844', 'provenance': [{'wikipedia_id': '37412', 'title': 'Gold standard', 'start_paragraph_id': 18, 'start_character': 404, 'end_paragraph_id': 18, 'end_character': 408, 'bleu_score': 1.0, 'section': 'Section::::History.:Silver.:United Kingdom.\n'}]}, {'provenance': [{'wikipedia_id': '37412', 'title': 'Gold standard', 'start_paragraph_id': 18, 'start_character': 0, 'end_paragraph_id': 18, 'end_character': 673, 'bleu_score': 0.9825310706027971, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14472112492344588404}, 'section': 'Section::::History.:Silver.:United Kingdom.\n'}]}]