With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Régine Chassagne is a multi-instrumentalist musician.
text_B: Hildoceras bifrons is an extinct species of ammonite in the family Hildoceratidae .. Hildoceratidae. Hildoceratidae. Hildoceras. Hildoceras. ammonite. Ammonitida. It dates from about 175 million years ago in the Early Jurassic when it was both widespread and common .. Early Jurassic. Early Jurassic. Fossils have been found in North Africa and Europe , including several regions of England .
not_related.