Question: who has the most gold bars in the world
[{'answer': 'United States', 'provenance': [{'wikipedia_id': '1056205', 'title': 'Gold reserve', 'start_paragraph_id': 6, 'start_character': 109, 'end_paragraph_id': 6, 'end_character': 122, 'bleu_score': 1.0, 'section': 'Section::::Wartime relevance.\n'}]}]