With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Heartbreak Ridge was produced by a goldfish.
text_B: Hunnanocephalus is an extinct genus from a well-known class of fossil marine arthropods , the trilobites .. extinct. extinct. genus. genus. fossil. fossil. It lived during the early part of the Botomian stage , which lasted from approximately 524 to 518.5 million years ago .. Botomian. Botomian. Botomian stage. Botomian. This faunal stage was part of the Cambrian Period .. Cambrian Period. Cambrian Period
not_related.