Question: which group was considered the backbone of chinese society
[{'answer': 'wealthy and successful businessmen', 'provenance': [{'wikipedia_id': '21786810', 'title': 'Society and culture of the Han dynasty', 'start_paragraph_id': 3, 'start_character': 148, 'end_paragraph_id': 3, 'end_character': 182, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '21786810', 'title': 'Society and culture of the Han dynasty', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 963, 'bleu_score': 0.9860618656782161, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5987716930788358807}, 'section': 'Section::::Abstract.'}]}]