Question: how many us troops died in the vietnam war
[{'answer': '58,318', 'provenance': [{'wikipedia_id': '1449184', 'title': 'Vietnam War casualties', 'start_paragraph_id': 46, 'start_character': 12, 'end_paragraph_id': 46, 'end_character': 17, 'bleu_score': 1.0, 'section': 'Section::::United States armed forces.\n'}]}]