Question: which countries lost the most soldiers in ww2
[{'answer': 'Soviet Union', 'provenance': [{'wikipedia_id': '240900', 'title': 'World War II casualties', 'start_paragraph_id': 3, 'start_character': 361, 'end_paragraph_id': 3, 'end_character': 373, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]