Question: who is the actor of uma in descendants 2
[{'answer': 'China Anne McClain', 'provenance': [{'wikipedia_id': '50444775', 'title': 'Descendants 2', 'start_paragraph_id': 1, 'start_character': 444, 'end_paragraph_id': 1, 'end_character': 462, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]