Question: who plays lina mayfleet in the city of ember
[{'answer': 'Saoirse Ronan', 'provenance': [{'wikipedia_id': '11845883', 'title': 'City of Ember', 'start_paragraph_id': 1, 'start_character': 164, 'end_paragraph_id': 1, 'end_character': 177, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '11845883', 'title': 'City of Ember', 'start_paragraph_id': 9, 'start_character': 0, 'end_paragraph_id': 9, 'end_character': 42, 'bleu_score': 0.6147881529512641, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10115745304597854095}, 'section': 'Section::::Cast.\n'}]}]