With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Christopher Nolan worked on The Dark Knight Trilogy.
text_B: Bill Treacher -LRB- born 4 June 1930 in London -RRB- is a retired English actor .. London. London. He is best known for playing Arthur Fowler on the BBC soap opera EastEnders , for 11 years from 1985 to 1996 , He was also the first person on the show to be cast .. Arthur Fowler. Arthur Fowler. BBC. BBC. EastEnders. EastEnders
not_related.