Question: the federal reserve is an example of a(n)
[{'answer': 'central banking system', 'provenance': [{'wikipedia_id': '10819', 'title': 'Federal Reserve', 'start_paragraph_id': 1, 'start_character': 88, 'end_paragraph_id': 1, 'end_character': 110, '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': 6635373761618609773}, 'section': 'Section::::Abstract.'}]}]