Question: who does luann's voice on king of the hill
[{'answer': 'Brittany Murphy', 'provenance': [{'wikipedia_id': '5541204', 'title': 'List of King of the Hill characters', 'start_paragraph_id': 9, 'start_character': 58, 'end_paragraph_id': 9, 'end_character': 73, 'bleu_score': 1.0, 'section': 'Section::::Main characters.\n'}]}, {'provenance': [{'wikipedia_id': '5541204', 'title': 'List of King of the Hill characters', 'start_paragraph_id': 9, 'start_character': 12, 'end_paragraph_id': 9, 'end_character': 1452, 'bleu_score': 0.9581098248910521, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16092554865974987098}, 'section': 'Section::::Main characters.\n'}]}]