Question: is a 12 volt system ac or dc
[{'answer': 'DC', 'provenance': [{'wikipedia_id': '47713', 'title': 'Direct current', 'start_paragraph_id': 1, 'start_character': 16, 'end_paragraph_id': 1, 'end_character': 18, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]