Question: what caused the bread riots in richmond in 1863
[{'answer': 'Inflation', 'provenance': [{'wikipedia_id': '6273051', 'title': 'Southern bread riots', 'start_paragraph_id': 4, 'start_character': 12, 'end_paragraph_id': 4, 'end_character': 21, 'bleu_score': 1.0, 'section': 'Section::::Causes.\n'}]}, {'answer': 'Refugees', 'provenance': [{'wikipedia_id': '6273051', 'title': 'Southern bread riots', 'start_paragraph_id': 5, 'start_character': 12, 'end_paragraph_id': 5, 'end_character': 20, 'bleu_score': 1.0, 'section': 'Section::::Causes.\n'}]}, {'answer': 'drought', 'provenance': [{'wikipedia_id': '6273051', 'title': 'Southern bread riots', 'start_paragraph_id': 8, 'start_character': 16, 'end_paragraph_id': 8, 'end_character': 23, 'bleu_score': 1.0, 'section': 'Section::::Causes.\n'}]}, {'answer': 'internal transportation became increasingly difficult', 'provenance': [{'wikipedia_id': '6273051', 'title': 'Southern bread riots', 'start_paragraph_id': 7, 'start_character': 86, 'end_paragraph_id': 7, 'end_character': 139, 'bleu_score': 1.0, 'section': 'Section::::Causes.\n'}]}, {'answer': 'Salt', 'provenance': [{'wikipedia_id': '6273051', 'title': 'Southern bread riots', 'start_paragraph_id': 9, 'start_character': 253, 'end_paragraph_id': 9, 'end_character': 257, 'bleu_score': 1.0, 'section': 'Section::::Causes.\n'}]}, {'answer': 'Food supplies', 'provenance': [{'wikipedia_id': '6273051', 'title': 'Southern bread riots', 'start_paragraph_id': 6, 'start_character': 12, 'end_paragraph_id': 6, 'end_character': 25, 'bleu_score': 1.0, 'section': 'Section::::Causes.\n'}]}]