With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Mark Wahlberg co-owns a dining restaurant.
text_B: Thomas Brewster is a fictional character played by John Pickard in a series of audio plays produced by Big Finish Productions based on the long-running British science fiction television series Doctor Who .. John Pickard. John Pickard ( British actor ). Big Finish Productions. Big Finish Productions. science fiction television. science fiction on television. Doctor Who. Doctor Who. An orphan and street urchin from 19th-century London , he is a companion of the Fifth and Sixth Doctors .. 19th-century London. 19th-century London. companion. Companion ( Doctor Who ). Fifth. Fifth Doctor
not_related.