With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Maria Sharapova failed a drug test at the 2016 Australian Open.
text_B: The Vikinghøgda Formation is a geologic formation in Norway .. Formation. Formation ( stratigraphy ). Norway. Norway. geologic formation. Formation ( geology ). It preserves fossils dating back to the Triassic period .. Triassic. Triassic. fossils. fossils. period. Period ( geology )
not_related.