With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Thanos is a character that appeared in video games.
text_B: Proofreading is the reading of a galley proof or an electronic copy of a publication to detect and correct production errors of text or art .. reading. reading ( activity ). galley proof. galley proof. text. writing. art. Graphic arts
not_related.