With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Alan Rickman died in 2016.
text_B: In human genetics , Haplogroup UK was a human mitochondrial DNA -LRB- mtDNA -RRB- haplogroup .. human genetics. human genetics. human. human. mitochondrial DNA. Human mitochondrial genetics. haplogroup. haplogroup. It is now known that K is a subclade of U8 .. subclade. subclade. Haplogroup U ( mtDNA )#Haplogroup U8
not_related.