With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Supernatural (U.S. TV series) was first aired on The WB in September of 2005.
text_B: Princess Katarina of Yugoslavia -LRB- born 28 November 1959 -RRB- is a princess of the former Kingdom of Yugoslavia and a member of the House of Karađorđevic .. Karađorđevic. Karađorđevic dynasty. Kingdom of Yugoslavia. Kingdom of Yugoslavia. House of Karađorđevic. House of Karađorđevic. She manages her own businesses and undertakes various commercial work around the world .
not_related.