With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Helen Keller's instructor also served as her lifelong companion.
text_B: Johanna Mansfield Sullivan Macy -LRB- April 14 , 1866 -- October 20 , 1936 -RRB- , better known as Anne Sullivan , was an American teacher , best known for being the instructor and lifelong companion of Helen Keller .. Helen Keller. Helen Keller. At the age of five , she contracted trachoma , a highly contagious eye disease , which left her blind and without reading or writing skills .. trachoma. trachoma. She received her education as a student of the Perkins School for the Blind where upon graduation she became a teacher to Keller when she was 20 .. Perkins School for the Blind. Perkins School for the Blind
related.