With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Sarah Silverman never appeared in a sitcom.
text_B: Sam Coulson -LRB- born 9 February 1987 -RRB- is an English guitarist , best known for being a member of progressive rock band Asia since 2013 , after his guitar-playing skills were noticed on the video hosting website YouTube .. progressive rock. progressive rock. Asia. Asia ( band ). YouTube. YouTube
not_related.