With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Frank Sinatra was from America.
text_B: The Seidel-Arop was a German automobile manufactured from 1925 until 1926 .. German. Germany. automobile. automobile. A small car , it was doomed to failure by lack of adequate production facilities ; a model with a sv 1020cc four-cylinder engine was the only one offered .. engine. engine
not_related.