Question: which term refers to linking a currency value to the value of gold
[{'answer': 'gold specie standard', 'provenance': [{'wikipedia_id': '37412', 'title': 'Gold standard', 'start_paragraph_id': 3, 'start_character': 51, 'end_paragraph_id': 3, 'end_character': 71, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '37412', 'title': 'Gold standard', 'start_paragraph_id': 3, 'start_character': 63, 'end_paragraph_id': 3, 'end_character': 303, 'bleu_score': 0.8441938259473991, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12758993652220119069}, 'section': 'Section::::History.\n'}]}]