With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Nelson Mandela participated in philanthropy.
text_B: Toe tights are tights with individual toes , in the same way toe socks are socks with individual toes .. tights. tights. toe socks. toe socks. They are Japan-exclusive novelty items .. Japan. Japan
not_related.