Question: cuba is one of the world's leading producers of
[{'answer': 'nickel', 'provenance': [{'wikipedia_id': '5042481', 'title': 'Cuba', 'start_paragraph_id': 91, 'start_character': 258, 'end_paragraph_id': 91, 'end_character': 264, 'bleu_score': 1.0, 'section': 'Section::::Economy.\n'}]}, {'provenance': [{'wikipedia_id': '5042481', 'title': 'Cuba', 'start_paragraph_id': 97, 'start_character': 7, 'end_paragraph_id': 97, 'end_character': 534, 'bleu_score': 0.797122845564263, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17285866903612646722}, 'section': 'Section::::Economy.:Resources.\n'}]}]