With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Vitamin B-12 plays a key role in the formation of red blood cells.
text_B: Swiss Cycling is the national governing body of cycle racing in Switzerland .. governing body. sport governing body. cycle racing. bicycle racing. Switzerland. Switzerland. The organisation is a member of the UCI and the UEC .. UCI. Union Cycliste Internationale. UEC. Union Europeenne de Cyclisme
not_related.