Question: electric wires are covered with rubber like material give reason
[{'answer': 'insulation', 'provenance': [{'wikipedia_id': '15066', 'title': 'Insulator (electricity)', 'start_paragraph_id': 2, 'start_character': 680, 'end_paragraph_id': 2, 'end_character': 690, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '15066', 'title': 'Insulator (electricity)', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 830, 'bleu_score': 0.9843125095516201, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8759238565850879754}, 'section': 'Section::::Abstract.'}]}]