Question: what is the population of houston and surrounding areas
[{'answer': '2.3 million', 'provenance': [{'wikipedia_id': '322524', 'title': 'Greater Houston', 'start_paragraph_id': 1, 'start_character': 579, 'end_paragraph_id': 1, 'end_character': 590, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '322524', 'title': 'Greater Houston', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 562, 'bleu_score': 0.594636705748193, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 607845382063988667}, 'section': 'Section::::Abstract.'}]}]