Question: what's the population of the greater chicago area
[{'answer': '9.4 million'}, {'provenance': [{'wikipedia_id': '326456', 'title': 'Chicago metropolitan area', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 296, 'bleu_score': 0.7177279635577201, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17359438441107527793}, 'section': 'Section::::Abstract.'}]}]