With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: George W. Romney was Barack Obama's father.
text_B: Cephonodes rufescens is a moth of the Sphingidae family .. Sphingidae. Sphingidae. Cephonodes. Cephonodes. moth. moth. It is known from Madagascar .. Madagascar. Madagascar. The upperside of the head , thorax and wing bases is unicolorous brown .. The abdomen is reddish mixed with brown .
not_related.