With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: The International Space Station does not serve as a research laboratory.
text_B: Farhad Salafzoon -LRB- born -RRB- is an Iranian male volleyball player .. volleyball. volleyball. With his club Kalleh Sports Club he competed at the 2013 FIVB Volleyball Men 's Club World Championship .. Kalleh Sports Club. Kalleh Sports Club
not_related.