Question: who did the us fight in world war i
[{'answer': 'Central Powers', 'provenance': [{'wikipedia_id': '4764461', 'title': 'World War I', 'start_paragraph_id': 4, 'start_character': 1271, 'end_paragraph_id': 4, 'end_character': 1285, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]