With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: An episode of The Blacklist was directed by an American screenwriter.
text_B: Nikolai Semashko may refer to  :. Nikolai Semashko -LRB- medicine -RRB- -LRB- 1874 -- 1949 -RRB- , Soviet medicine organizer and politician. Nikolai Semashko -LRB- basketball -RRB- -LRB- 1907 -- 1976 -RRB- , Soviet sports administrator
not_related.