With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: R. Madhavan was a fitness guru.
text_B: Panther Creek is a stream in the U.S. state of Missouri .. stream. stream. U.S. state. U.S. state. Missouri. Missouri. It is a tributary of the Blackwater River .. Blackwater River. Blackwater River ( Missouri ). Panther Creek was named for the panthers which once roamed there .
not_related.