Question: what type of goods were traded on the columbian exchange
[{'answer': 'plants', 'provenance': [{'wikipedia_id': '622746', 'title': 'Columbian exchange', 'start_paragraph_id': 1, 'start_character': 128, 'end_paragraph_id': 1, 'end_character': 134, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'animals', 'provenance': [{'wikipedia_id': '622746', 'title': 'Columbian exchange', 'start_paragraph_id': 1, 'start_character': 136, 'end_paragraph_id': 1, 'end_character': 143, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'human populations', 'provenance': [{'wikipedia_id': '622746', 'title': 'Columbian exchange', 'start_paragraph_id': 1, 'start_character': 154, 'end_paragraph_id': 1, 'end_character': 171, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'technology', 'provenance': [{'wikipedia_id': '622746', 'title': 'Columbian exchange', 'start_paragraph_id': 1, 'start_character': 173, 'end_paragraph_id': 1, 'end_character': 183, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '622746', 'title': 'Columbian exchange', 'start_paragraph_id': 1, 'start_character': 95, 'end_paragraph_id': 1, 'end_character': 691, 'bleu_score': 0.7512521551810101, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9502338989430071116}, 'section': 'Section::::Abstract.'}]}]