Question: what were the two classes of roman society
[{'answer': 'patricians', 'provenance': [{'wikipedia_id': '3453921', 'title': 'Social class in ancient Rome', 'start_paragraph_id': 10, 'start_character': 111, 'end_paragraph_id': 10, 'end_character': 121, 'bleu_score': 1.0, 'section': 'Section::::Patricians and plebeians.\n'}]}, {'answer': 'plebeians', 'provenance': [{'wikipedia_id': '3453921', 'title': 'Social class in ancient Rome', 'start_paragraph_id': 9, 'start_character': 26, 'end_paragraph_id': 9, 'end_character': 35, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '3453921', 'title': 'Social class in ancient Rome', 'start_paragraph_id': 10, 'start_character': 0, 'end_paragraph_id': 10, 'end_character': 646, 'bleu_score': 0.9810405040225261, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4893582942494802419}, 'section': 'Section::::Patricians and plebeians.\n'}]}]