Question: who won the most medals in vancouver olympics
[{'answer': 'United States', 'provenance': [{'wikipedia_id': '18940490', 'title': '2010 Winter Olympics medal table', 'start_paragraph_id': 2, 'start_character': 714, 'end_paragraph_id': 2, 'end_character': 727, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '18940490', 'title': '2010 Winter Olympics medal table', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 1042, 'bleu_score': 0.9721015417051191, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1792819743521084230}, 'section': 'Section::::Abstract.'}]}]