With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Centralia, Pennsylvania had a coal mine fire in 1962.
text_B: Oxyagnostus is an extinct genus from a well-known class of fossil marine arthropods , the trilobites .. extinct. extinct. genus. genus. fossil. fossil. It lived from 501 to 490 million years ago during the Dresbachian faunal stage of the late Cambrian Period .. Dresbachian. Dresbachian. faunal stage. faunal stage. Cambrian Period. Cambrian Period
not_related.