Question: who are the main actors in fifty shades of grey
[{'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.'}]}, {'provenance': [{'wikipedia_id': '40218034', 'title': 'Fifty Shades of Grey (film)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 369, 'bleu_score': 0.817960858978925, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5772039918061222759}, 'section': 'Section::::Abstract.'}]}]