With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Willow Smith is an actress.
text_B: Thomas Head Raddall , OC , FRSC -LRB- 13 November 1903 -- 1 April 1994 -RRB- was a Canadian writer of history and historical fiction .. Order of Canada. FRSC. Royal Society of Canada
not_related.