With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Novak Djokovic was unqualified to compete in the Summer Olympics in Beijing.
text_B: Paul Hesse -LRB- 3 February 1857 -- 26 February 1938 -RRB- was a German zoologist , who specialised in the study of Mollusca .. German. Germany. zoologist. Zoology. Mollusca. Mollusca. In 1926 , the Academy of Natural Sciences of Pennsylvania purchased a collection of about 50,000 specimens from Hesse , mainly focusing on non-marine molluscs from Europe .. Academy of Natural Sciences of Pennsylvania. Academy of Natural Sciences of Pennsylvania
not_related.