Question: who were the subjects of most roman sculptures
[{'answer': 'ancestors', 'provenance': [{'wikipedia_id': '3326120', 'title': 'Roman sculpture', 'start_paragraph_id': 6, 'start_character': 254, 'end_paragraph_id': 6, 'end_character': 263, 'bleu_score': 1.0, 'section': 'Section::::Development.\n'}]}, {'provenance': [{'wikipedia_id': '3326120', 'title': 'Roman sculpture', 'start_paragraph_id': 12, 'start_character': 0, 'end_paragraph_id': 12, 'end_character': 706, 'bleu_score': 0.9815648442794911, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12414468896659543505}, 'section': 'Section::::Portraiture.\n'}]}]