Question: what are three main sources of income for cuba
[{'answer': 'sugar', 'provenance': [{'wikipedia_id': '5042481', 'title': 'Cuba', 'start_paragraph_id': 4, 'start_character': 307, 'end_paragraph_id': 4, 'end_character': 312, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'tobacco', 'provenance': [{'wikipedia_id': '5042481', 'title': 'Cuba', 'start_paragraph_id': 4, 'start_character': 314, 'end_paragraph_id': 4, 'end_character': 321, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'coffee', 'provenance': [{'wikipedia_id': '5042481', 'title': 'Cuba', 'start_paragraph_id': 4, 'start_character': 323, 'end_paragraph_id': 4, 'end_character': 329, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'skilled labor', 'provenance': [{'wikipedia_id': '5042481', 'title': 'Cuba', 'start_paragraph_id': 4, 'start_character': 334, 'end_paragraph_id': 4, 'end_character': 347, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '5042481', 'title': 'Cuba', 'start_paragraph_id': 4, 'start_character': 129, 'end_paragraph_id': 4, 'end_character': 705, 'bleu_score': 0.711393090280229, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7614252516136848164}, 'section': 'Section::::Abstract.'}]}]