Question: in which form of art were the romans most innovative
[{'answer': 'architecture', 'provenance': [{'wikipedia_id': '1076505', 'title': 'Roman art', 'start_paragraph_id': 1, 'start_character': 120, 'end_paragraph_id': 1, 'end_character': 132, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1076505', 'title': 'Roman art', 'start_paragraph_id': 57, 'start_character': 0, 'end_paragraph_id': 57, 'end_character': 831, 'bleu_score': 0.9850176677359421, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9482225418169745865}, 'section': 'Section::::Architecture.\n'}]}]