Question: what was the main source of income in colonial virginia
[{'answer': 'tobacco', 'provenance': [{'wikipedia_id': '2164837', 'title': 'History of Virginia', 'start_paragraph_id': 1, 'start_character': 630, 'end_paragraph_id': 1, 'end_character': 637, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2164837', 'title': 'History of Virginia', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 1423, 'bleu_score': 0.9691303248930321, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13226825727752468472}, 'section': 'Section::::Abstract.'}]}]