Question: what is the population of greenville county south carolina
[{'answer': '506,837'}, {'provenance': [{'wikipedia_id': '91887', 'title': 'Greenville County, South Carolina', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 457, 'bleu_score': 0.9062950209722, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4441452510208397361}, 'section': 'Section::::Abstract.'}]}]