Question: who plays anna in girl on the train
[{'answer': 'Rebecca Ferguson', 'provenance': [{'wikipedia_id': '46883270', 'title': 'The Girl on the Train (2016 film)', 'start_paragraph_id': 1, 'start_character': 240, 'end_paragraph_id': 1, 'end_character': 256, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '46883270', 'title': 'The Girl on the Train (2016 film)', 'start_paragraph_id': 21, 'start_character': 0, 'end_paragraph_id': 21, 'end_character': 85, 'bleu_score': 0.673904706256473, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17584043709278711553}, 'section': 'Section::::Cast.\n'}]}]