Question: who plays ruby in the darkest minds movie
[{'answer': 'Amandla Stenberg', 'provenance': [{'wikipedia_id': '53923310', 'title': 'The Darkest Minds', 'start_paragraph_id': 1, 'start_character': 217, 'end_paragraph_id': 1, 'end_character': 233, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]