Question: who is the biggest buyer of us debt
[{'answer': 'the public', 'provenance': [{'wikipedia_id': '322221', 'title': 'National debt of the United States', 'start_paragraph_id': 6, 'start_character': 284, 'end_paragraph_id': 6, 'end_character': 294, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '322221', 'title': 'National debt of the United States', 'start_paragraph_id': 16, 'start_character': 0, 'end_paragraph_id': 16, 'end_character': 446, 'bleu_score': 0.556276739198683, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15737969660664903248}, 'section': 'Section::::Valuation and measurement.:Public and government accounts.\n'}]}]