Question: when did korea split into north korea and south korea
[{'answer': '1945', 'provenance': [{'wikipedia_id': '325746', 'title': 'Division of Korea', 'start_paragraph_id': 1, 'start_character': 58, 'end_paragraph_id': 1, 'end_character': 62, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]