With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Dementia, a brain disease, changed the line up for AC/DC.
text_B: Frederick Clifford Dixon -LRB- 5 December 1902 -- 5 May 1992 -RRB- was notable for his etchings depicting urban life in London in an intricate , realistic and witty manner .. etchings. etchings. His artistic career was cut short with the decline in the print market after the boom years of the 1920s .. He then embarked on a career as an art teacher in order to make a living .
not_related.