Question: who does dakota johnson play in 50 shades of grey
[{'answer': 'Anastasia Steele', 'provenance': [{'wikipedia_id': '7000810', 'title': 'Dakota Johnson', 'start_paragraph_id': 2, 'start_character': 277, 'end_paragraph_id': 2, 'end_character': 293, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]