Question: what is the parallel that splits korea in half
[{'answer': 'the 38th parallel', 'provenance': [{'wikipedia_id': '325746', 'title': 'Division of Korea', 'start_paragraph_id': 1, 'start_character': 245, 'end_paragraph_id': 1, 'end_character': 262, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]