Question: the current central bank of the united states is
[{'answer': 'Federal Reserve', 'provenance': [{'wikipedia_id': '10819', 'title': 'Federal Reserve', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 15, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '10819', 'title': 'Federal Reserve', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 592, 'bleu_score': 0.9649773185979721, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17047383916164757378}, 'section': 'Section::::Abstract.'}]}]