Question: what was brought to europe from the americas
[{'answer': 'Potato', 'provenance': [{'wikipedia_id': '622746', 'title': 'Columbian exchange', 'start_paragraph_id': 9, 'start_character': 290, 'end_paragraph_id': 9, 'end_character': 296, 'bleu_score': 1.0, 'section': 'Section::::Influence.:Crops.\n'}]}, {'answer': 'maize', 'provenance': [{'wikipedia_id': '622746', 'title': 'Columbian exchange', 'start_paragraph_id': 2, 'start_character': 299, 'end_paragraph_id': 2, 'end_character': 304, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'tomato', 'provenance': [{'wikipedia_id': '622746', 'title': 'Columbian exchange', 'start_paragraph_id': 2, 'start_character': 320, 'end_paragraph_id': 2, 'end_character': 326, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'tobacco', 'provenance': [{'wikipedia_id': '622746', 'title': 'Columbian exchange', 'start_paragraph_id': 9, 'start_character': 105, 'end_paragraph_id': 9, 'end_character': 112, 'bleu_score': 1.0, 'section': 'Section::::Influence.:Crops.\n'}]}, {'provenance': [{'wikipedia_id': '622746', 'title': 'Columbian exchange', 'start_paragraph_id': 9, 'start_character': 0, 'end_paragraph_id': 9, 'end_character': 596, 'bleu_score': 0.761131772922469, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1463209407600823444}, 'section': 'Section::::Influence.:Crops.\n'}]}]