Question: how are point sources of pollution regulated by the cwa
[{'answer': 'Command and control policies', 'provenance': [{'wikipedia_id': '31183866', 'title': 'Nonpoint source water pollution regulations in the United States', 'start_paragraph_id': 66, 'start_character': 0, 'end_paragraph_id': 66, 'end_character': 28, 'bleu_score': 1.0, 'section': 'Section::::Policy instruments and regulatory approaches.:Command and control.\n'}]}, {'provenance': [{'wikipedia_id': '31183866', 'title': 'Nonpoint source water pollution regulations in the United States', 'start_paragraph_id': 66, 'start_character': 0, 'end_paragraph_id': 66, 'end_character': 679, 'bleu_score': 0.9804854598160591, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4697384587335578141}, 'section': 'Section::::Policy instruments and regulatory approaches.:Command and control.\n'}]}]