Question: when was the democratic republic of vietnam formed
[{'answer': 'September 2 , 1945'}, {'provenance': [{'wikipedia_id': '23550210', 'title': 'North Vietnam', 'start_paragraph_id': 8, 'start_character': 0, 'end_paragraph_id': 8, 'end_character': 716, 'bleu_score': 0.9085160095100151, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10989821754170236582}, 'section': 'Section::::Leadership under Hồ Chí Minh (1945–69).:Proclamation of the republic.\n'}]}]