Question: what two bodies of water does the isthmus of panama separate
[{'answer': 'Caribbean Sea', 'provenance': [{'wikipedia_id': '1404472', 'title': 'Isthmus of Panama', 'start_paragraph_id': 1, 'start_character': 129, 'end_paragraph_id': 1, 'end_character': 142, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1404472', 'title': 'Isthmus of Panama', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 374, 'bleu_score': 0.7104484132522331, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16570094288913973983}, 'section': 'Section::::Abstract.'}]}]