Question: what country has won the most gold medals in the summer olympics
[{'answer': 'United States', 'provenance': [{'wikipedia_id': '3729318', 'title': 'All-time Olympic Games medal table', 'start_paragraph_id': 78, 'start_character': 120, 'end_paragraph_id': 78, 'end_character': 133, 'bleu_score': 1.0, 'section': 'Section::::Notes.:Disputed participation notes.\n'}]}]