With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Gold is a metal on the periodic table.
text_B: Frigate Captain Augusto Bedacarratz is an Argentina naval aviator , who led the devastating mission on 4 May 1982 on HMS Sheffield -LRB- D80 -RRB- , during the Falklands War , with the Exocet AM .39 anti-ship missile .. Falklands War. Falklands War. Exocet. Exocet. It was the first sinking of a Royal Navy ship in four decades .. Royal Navy. Royal Navy
not_related.