Question: what country has the highest gross domestic product
[{'answer': 'United States', 'provenance': [{'wikipedia_id': '380845', 'title': 'List of countries by GDP (nominal)', 'start_paragraph_id': 3, 'start_character': 4, 'end_paragraph_id': 3, 'end_character': 17, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]