Question: when do high school students graduate in korea
[{'answer': 'at age 18 or 19', 'provenance': [{'wikipedia_id': '1495964', 'title': 'Education in South Korea', 'start_paragraph_id': 71, 'start_character': 148, 'end_paragraph_id': 71, 'end_character': 163, 'bleu_score': 1.0, 'section': 'Section::::Secondary education.:High school.\n'}]}, {'provenance': [{'wikipedia_id': '1495964', 'title': 'Education in South Korea', 'start_paragraph_id': 71, 'start_character': 0, 'end_paragraph_id': 71, 'end_character': 603, 'bleu_score': 0.5617348770750741, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10724376943334099718}, 'section': 'Section::::Secondary education.:High school.\n'}]}]