With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Sade (singer) had 23.5 million sales in the U.S.
text_B: The Nestin-class minesweeper is a class of minesweeper built specifically for naval mine clearing duties on rivers .. minesweeper. Minesweeper ( ship ). naval mine. naval mine. The class was built for the needs of the Yugoslav Navy on the Danube river , and was also sold to Hungary and Iraq during the 1970s and '80s .. Danube. Danube
not_related.