With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Vitamin B12 is not produced by animals.
text_B: Anton Aicher -LRB- 1859 -- 5 February 1930 -RRB- was the founding Artistic Director of the Salzburg Marionette Theatre .. Artistic Director. Artistic Director. Salzburg Marionette Theatre. Salzburg Marionette Theatre. He founded the company in 1913 and was its leader until his death .
not_related.