With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Metallica plays music.
text_B: Ahmad Kazemi -LRB- 22 July 1958 -- 9 January 2006 -RRB- was an Iranian commander in the Army of the Guardians of the Islamic Revolution and one of the most notable commanders in Iran -- Iraq War .. Army of the Guardians of the Islamic Revolution. Army of the Guardians of the Islamic Revolution. Iran. Iran
not_related.