Question: Suzanna Catharina de Graaff's claim of being the fifth daughter of Tsar Nicholas II and Tsarina Alexandra, was accepted by one of several imposters who clamed to be who?
{'answer': 'Grand Duchess Anastasia of Russia', 'supporting_facts': [['Suzanna Catharina de Graaff', 0], ['Suzanna Catharina de Graaff', 1], ['Anna Anderson', 0]]}