With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Azerbaijan is a country within the Muslim world.
text_B: The Wayland Center Historic District is a historic district on U.S. 20 and MA 27 in Wayland , Massachusetts .. It was added to the National Register of Historic Places in 1974 .. National Register of Historic Places. National Register of Historic Places
not_related.