With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Christian Bale's birth month was January.
text_B: Lambda Ursae Majoris -LRB- λ Ursae Majoris , abbreviated Lambda UMa , λ UMa -RRB- , also named Tania Borealis , is a star in the northern circumpolar constellation of Ursa Major .. Ursa Major. Ursa Major. star. star. circumpolar constellation. circumpolar constellation
not_related.