Question: the united states today uses which kind of currency
[{'answer': 'the dollar', 'provenance': [{'wikipedia_id': '18717338', 'title': 'United States dollar', 'start_paragraph_id': 1, 'start_character': 86, 'end_paragraph_id': 1, 'end_character': 96, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '18717338', 'title': 'United States dollar', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 483, 'bleu_score': 0.726167357672156, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16584768310373455323}, 'section': 'Section::::Abstract.'}]}]