With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: One style of the mandolin is the flat-backed dolphin.
text_B: Dragoslav S. Mitrinovic -LRB- Serbian Cyrillic  : Драгослав Митриновић ; 23 June 1908 -- 2 April 1995 -RRB- was a Serbian mathematician known for his work in differential equations , functional equations , complex analysis .. Serbian Cyrillic. Serbian Cyrillic. mathematician. mathematician. differential equations. differential equations. functional equations. functional equations. complex analysis. complex analysis. He authored near 300 scientific journal papers and more than twelve books in his area .
not_related.