With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Not all tumors indicate cancer, some are benign.
text_B: The Manhattan Brothers was a popular South African singing group in the 1940s and 1950s , during the Apartheid era .. Apartheid era. Apartheid era. Their sound drew on American ragtime , jive , swing , doo-wop , and several other jazz strains , as well as African choral and Zulu harmonies .. Members of the group included Joe Mogotsi , Ronnie Sehume , Rufus Khoza , the late Nathan Mdledle , and Miriam Makeba .. Miriam Makeba. Miriam Makeba. Makeba , who went on to international fame , started her career with The Manhattan Brothers and was part of the group for much of the 1950s .. The group had one US Billboard pop chart hit , `` Lovely Lies '' , which peaked at # 45 in March 1956 .. United States. Billboard. Billboard ( magazine ). pop. Billboard Hot 100. chart. record chart. Joe Mogotsi died on 19 May 2011 in Johannesburg , following a long illness .. Johannesburg. Johannesburg
not_related.