Question: who stars in the 50 shades of grey movie
[{'answer': 'Dakota Johnson', 'provenance': [{'wikipedia_id': '40218034', 'title': 'Fifty Shades of Grey (film)', 'start_paragraph_id': 1, 'start_character': 206, 'end_paragraph_id': 1, 'end_character': 220, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Jamie Dornan', 'provenance': [{'wikipedia_id': '40218034', 'title': 'Fifty Shades of Grey (film)', 'start_paragraph_id': 1, 'start_character': 357, 'end_paragraph_id': 1, 'end_character': 369, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Jennifer Ehle', 'provenance': [{'wikipedia_id': '40218034', 'title': 'Fifty Shades of Grey (film)', 'start_paragraph_id': 38, 'start_character': 29, 'end_paragraph_id': 38, 'end_character': 42, 'bleu_score': 1.0, 'section': 'Section::::Production.:Casting.\n'}]}, {'answer': 'Marcia Gay Harden', 'provenance': [{'wikipedia_id': '40218034', 'title': 'Fifty Shades of Grey (film)', 'start_paragraph_id': 38, 'start_character': 775, 'end_paragraph_id': 38, 'end_character': 792, 'bleu_score': 1.0, 'section': 'Section::::Production.:Casting.\n'}]}]