With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: David Tennant did not play the Tenth Doctor in Doctor Who.
text_B: The TA BlueTech Index is a stock market index all capitalised information technology and biotechnology companies listed on the Tel Aviv Stock Exchange -LRB- TASE -RRB- .. stock market index. stock market index. capitalised. market capitalisation. information technology. information technology. biotechnology. biotechnology. Tel Aviv Stock Exchange. Tel Aviv Stock Exchange. The index was launched on 3 April 2011 as the TA BlueTech-50 Index and replaced the Tel-Tech Index and the Tel-Tech 15 Index .. In June 2014 , as a result of changes in the criteria required for companies to be listed in the Index , its name was changed to `` TA BlueTech Index '' .
not_related.