With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Scooby-Doo does not exist.
text_B: The Murfreesboro Limestone is a geologic formation in Tennessee .. geologic formation. Formation ( geology ). Tennessee. Tennessee. It preserves fossils dating back to the Ordovician period .. Ordovician. Ordovician. fossils. fossils. period. Period ( geology )
not_related.