With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Malcolm Young co-founded AC/DC in Australia.
text_B: Edward Pierson Ramsay -LRB- 3 December 1842 -- 16 December 1916 -RRB- was an Australian zoologist who specialised in ornithology .. zoologist. zoologist. ornithology. ornithology
not_related.