Question: where was the last winter olympics held in the usa
[{'answer': 'Salt Lake City', 'provenance': [{'wikipedia_id': '34069', 'title': 'Winter Olympic Games', 'start_paragraph_id': 29, 'start_character': 616, 'end_paragraph_id': 29, 'end_character': 630, 'bleu_score': 1.0, 'section': 'Section::::History.:20th century.:1964 to 1980.\n'}]}]