Question: where do purple martins go in the winter time
[{'answer': 'South America', 'provenance': [{'wikipedia_id': '18952673', 'title': 'Purple martin', 'start_paragraph_id': 20, 'start_character': 13, 'end_paragraph_id': 20, 'end_character': 26, 'bleu_score': 1.0, 'section': 'Section::::Behavior.:Migration.\n'}]}, {'provenance': [{'wikipedia_id': '18952673', 'title': 'Purple martin', 'start_paragraph_id': 20, 'start_character': 0, 'end_paragraph_id': 20, 'end_character': 327, 'bleu_score': 0.9645876452711911, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13987637367963000599}, 'section': 'Section::::Behavior.:Migration.\n'}]}]