Task: Question Understanding
Input (English): Context : Anna Hedvig Büll (born Anna Hedwig Bühl, 4 February (O.S. 23 January) 1887 -- 3 October 1981) was an Estonian missionary of Baltic German extraction who helped to save the lives of several thousand Armenian orphans during the Armenian Genocide. 
Question : Which sex or gender can Anna Hedvig Büll be described as?
Output (English): sex or gender