Question: Anna Anderson (16 December 1896 – 12 February 1984) was the best known of several impostors who claimed to be Grand Duchess Anastasia of Russia, was the youngest daughter of the last Tsar and Tsarina of Russia, Alexandra and Nicholas II, the last Emperor of Russia, ruling from 1 November 1894 until his forced abdication on which date?
{'answer': '15 March 1917', 'supporting_facts': [['Anna Anderson', 1], ['Nicholas II of Russia', 0]]}