Question: which country has the most gold medals in the 2012 olympics
[{'answer': 'United States', 'provenance': [{'wikipedia_id': '34832586', 'title': '2012 Summer Olympics medal table', 'start_paragraph_id': 2, 'start_character': 113, 'end_paragraph_id': 2, 'end_character': 126, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]