Question: who plays young ruth in never let me go
[{'answer': 'Ella Purnell', 'provenance': [{'wikipedia_id': '22547614', 'title': 'Never Let Me Go (2010 film)', 'start_paragraph_id': 32, 'start_character': 586, 'end_paragraph_id': 32, 'end_character': 598, 'bleu_score': 1.0, 'section': 'Section::::Production.:Casting.\n'}]}]