Question: who played princess elizabeth in the white queen
[{'answer': 'Rebecca Ferguson', 'provenance': [{'wikipedia_id': '37619511', 'title': 'The White Queen (miniseries)', 'start_paragraph_id': 45, 'start_character': 257, 'end_paragraph_id': 45, 'end_character': 273, 'bleu_score': 1.0, 'section': 'Section::::Cast.:Supporting.\n'}]}]