With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Selena Gomez has released at least two group albums.
text_B: Radiation sickness may refer to  :. Radiation Sickness -LRB- video -RRB- , a video by the thrash metal band Nuclear Assault. Radiation poisoning , a sickness caused by exposure to radiation. Radiation poisoning. Radiation poisoning. Radiation Sickness -LRB- band -RRB- , a U.S. crossover band founded in 1987
not_related.