Question: into what body of water does the danube river flow
[{'answer': 'Black Sea', 'provenance': [{'wikipedia_id': '21209639', 'title': 'Danube', 'start_paragraph_id': 2, 'start_character': 339, 'end_paragraph_id': 2, 'end_character': 348, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]