With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: In 2012, Yelp existed.
text_B: Colias croceus is a small butterfly of the Pieridae family , that is , the yellows and whites .. Pieridae. Pieridae. Colias. Colias. butterfly. butterfly. In India and nearby regions it is known as the dark clouded yellow or common clouded yellow to distinguish it from the other species of clouded yellows occurring there ; elsewhere it is often simply known as the clouded yellow , as it was the first and original butterfly to go by this name .. butterfly. butterfly. clouded yellow. clouded yellow
not_related.