With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Charles Mackay is a dog.
text_B: Charles Mackay -LRB- 27 March 1814 -- 24 December 1889 -RRB- was a Scottish poet , journalist , author , anthologist , novelist , and songwriter , remembered mainly for his book Extraordinary Popular Delusions and the Madness of Crowds .. Extraordinary Popular Delusions and the Madness of Crowds. Extraordinary Popular Delusions and the Madness of Crowds
related.