Question: where does the amazon river start and finish
[{'answer': 'Rio Mantaro'}, {'answer': 'Atlantic Ocean', 'provenance': [{'wikipedia_id': '1701', 'title': 'Amazon River', 'start_paragraph_id': 3, 'start_character': 466, 'end_paragraph_id': 3, 'end_character': 480, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]