Question: who played the roll of elizabeth swann in pirates of the caribbean
[{'answer': 'Keira Knightley', 'provenance': [{'wikipedia_id': '900291', 'title': 'Elizabeth Swann', 'start_paragraph_id': 1, 'start_character': 220, 'end_paragraph_id': 1, 'end_character': 235, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '900291', 'title': 'Elizabeth Swann', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 476, 'bleu_score': 0.7373674576930691, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7218062489485880241}, 'section': 'Section::::Abstract.'}]}]