With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Alexander Lebedev is a person.
text_B: The Onny Shale is a geologic formation in Wales .. Wales. Wales. geologic formation. Formation ( geology ). It preserves fossils dating back to the Ordovician period .. Ordovician. Ordovician. fossils. fossils. period. Period ( geology )
not_related.