With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Mark Zuckerberg is one of the 100 poorest people in the world.
text_B: Schreiber is a German surname meaning `` scribe '' or `` writer '' ; often compared to English Clark or Clerk .. German surname. German surname. Schreiber may refer to  :
not_related.