Definition: In this task, you will be presented with a text, a pronoun from the text, and two candidate names. You should determine what the pronoun refers to and classify the answers into A, B, or Neither. A and B here are referring to option A and option B. Position of the pronoun in the text is showed within two "_"s.
Input: Helen studied medicine at the University of St. Petersburg following their marriage, a career pursuit she had to give up when she gave birth to her first child. The couple had two children, Prince Vsevelod Ivanovich of Russia (20 January 1914 -- 18 June 1973), and Princess Catherine Ivanovna of Russia ( Pavlovsk 12 July 1915 - Montevideo, Uruguay 14 July 2007). The three children and seven grandchildren of _her_ daughter Princess Catherine, who married and later separated from Marchese Farace di Villaforesta, are the only great-grandchildren of Grand Duke Constantine Constantinovich of Russia and his wife Grand Duchess Elizabeth Mavrikievna. <sep>, Pronoun: her <sep>, A: Princess Catherine <sep>, B: Elizabeth Mavrikievna

Neither