Question: who plays the voice of roberta on the cleveland show
[{'answer': 'Reagan Gomez - Preston', 'provenance': [{'wikipedia_id': '16443524', 'title': 'The Cleveland Show', 'start_paragraph_id': 20, 'start_character': 180, 'end_paragraph_id': 20, 'end_character': 201, 'bleu_score': 1.0, 'section': 'Section::::Characters.\n'}]}, {'provenance': [{'wikipedia_id': '16443524', 'title': 'The Cleveland Show', 'start_paragraph_id': 14, 'start_character': 0, 'end_paragraph_id': 14, 'end_character': 548, 'bleu_score': 0.9505764710553931, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13183678599409217974}, 'section': 'Section::::Production.:Voice cast.\n'}]}]