With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Dean Martin was not a comedian.
text_B: Mary-Kay Wilmers -LRB- born 19 July 1938 -RRB- is an editor and journalist who has been the editor of the London Review of Books since 1992 .. London Review of Books. London Review of Books
not_related.