Question: who won the war on the eastern front
[{'answer': 'Soviet Union', 'provenance': [{'wikipedia_id': '519489', 'title': 'Eastern Front (World War II)', 'start_paragraph_id': 1, 'start_character': 132, 'end_paragraph_id': 1, 'end_character': 144, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]