With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Bette Davis is a male star.
text_B: Space Jam is a 1996 pinball machine released by Sega Pinball .. Sega Pinball. Sega Pinball. It is based on the film of the same name .. film of the same name. Space Jam
not_related.