Question: who owned the largest share of u.s government intragovernmental debt holdings at the end of 2016
[{'answer': 'China', 'provenance': [{'wikipedia_id': '322221', 'title': 'National debt of the United States', 'start_paragraph_id': 52, 'start_character': 249, 'end_paragraph_id': 52, 'end_character': 254, 'bleu_score': 1.0, 'section': 'Section::::Debt holdings.:Foreign holdings.\n'}]}, {'answer': 'Japan', 'provenance': [{'wikipedia_id': '322221', 'title': 'National debt of the United States', 'start_paragraph_id': 52, 'start_character': 273, 'end_paragraph_id': 52, 'end_character': 278, 'bleu_score': 1.0, 'section': 'Section::::Debt holdings.:Foreign holdings.\n'}]}, {'answer': 'Belgium'}, {'answer': 'the Caribbean banking centers'}, {'answer': 'oil exporters'}]