With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Leonardo DiCaprio is an American.
text_B: This article lists Counts , Dukes , Electors , and Kings ruling over different territories named Wurttemberg from the beginning of the County of Wurttemberg in the 11th century to the end of the Kingdom of Wurttemberg in 1918 .. Wurttemberg. Wurttemberg
not_related.