Question: what type of agency is the federal reserve board
[{'answer': 'an independent central bank', 'provenance': [{'wikipedia_id': '10819', 'title': 'Federal Reserve', 'start_paragraph_id': 4, 'start_character': 447, 'end_paragraph_id': 4, 'end_character': 474, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '10819', 'title': 'Federal Reserve', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 791, 'bleu_score': 0.915926107048282, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15766014821843415477}, 'section': 'Section::::Abstract.'}]}]