Question: what were shoes made of in ancient rome
[{'answer': 'leather', 'provenance': [{'wikipedia_id': '4905584', 'title': 'Caligae', 'start_paragraph_id': 3, 'start_character': 183, 'end_paragraph_id': 3, 'end_character': 190, 'bleu_score': 1.0, 'section': 'Section::::Name and history.\n'}]}, {'answer': 'iron hobnails'}]