Question: who is in charge of enforcing the 18th amendment
[{'answer': 'Volstead Act', 'provenance': [{'wikipedia_id': '31671', 'title': 'Eighteenth Amendment to the United States Constitution', 'start_paragraph_id': 2, 'start_character': 413, 'end_paragraph_id': 2, 'end_character': 425, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]