With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Doctor Who is produced.
text_B: HVDC Norway -- Germany may refer to the following proposed high-voltage direct current interconnection projects between Norway and Germany  :. high-voltage direct current. high-voltage direct current. NORD.LINK. NORD.LINK. NORD.LINK. NorGer. NorGer. NorGer
not_related.