Question: who are the actresses that play liv and maddie
[{'answer': 'Dove Cameron', 'provenance': [{'wikipedia_id': '38874307', 'title': 'Liv and Maddie', 'start_paragraph_id': 1, 'start_character': 234, 'end_paragraph_id': 1, 'end_character': 246, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]