Question: where is the line between north and south america
[{'answer': 'the Isthmus of Panama', 'provenance': [{'wikipedia_id': '13973661', 'title': 'Boundaries between the continents of Earth', 'start_paragraph_id': 27, 'start_character': 192, 'end_paragraph_id': 27, 'end_character': 213, 'bleu_score': 1.0, 'section': 'Section::::The Americas.:Mainland.\n'}]}]