Question: what is the shield on the back of a penny
[{'answer': 'Union Shield', 'provenance': [{'wikipedia_id': '164092', 'title': 'Penny (United States coin)', 'start_paragraph_id': 1, 'start_character': 616, 'end_paragraph_id': 1, 'end_character': 628, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '164092', 'title': 'Penny (United States coin)', 'start_paragraph_id': 1, 'start_character': 92, 'end_paragraph_id': 1, 'end_character': 849, 'bleu_score': 0.795218217900958, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7206174385821654014}, 'section': 'Section::::Abstract.'}]}]