With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: David Tennant played the Tenth Doctor in Doctor Who for 11 years.
text_B: Ralph M. Hughes -LRB- born April 17 , 1948 -RRB- is an American politician who represented district 40 in the Maryland State Senate from 1991 to 2007 and a member of the Maryland House of Delegates from the same district from 1983 to 1991 .. American politician. American politician. Maryland State Senate. Maryland State Senate. Maryland House of Delegates. Maryland House of Delegates
not_related.