Question: when did korea separate into north and south korea
[{'answer': '17 August 1945', 'provenance': [{'wikipedia_id': '325746', 'title': 'Division of Korea', 'start_paragraph_id': 10, 'start_character': 1016, 'end_paragraph_id': 10, 'end_character': 1030, 'bleu_score': 1.0, 'section': 'Section::::Historical background.:World War II.\n'}]}, {'provenance': [{'wikipedia_id': '325746', 'title': 'Division of Korea', 'start_paragraph_id': 10, 'start_character': 0, 'end_paragraph_id': 10, 'end_character': 1058, 'bleu_score': 0.710864415280496, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1747280754884857890}, 'section': 'Section::::Historical background.:World War II.\n'}]}]