With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: John Kiffmeyer is known professionally for his work at NASA.
text_B: John Kiffmeyer -LRB- born July 11 , 1969 -RRB- , known professionally in music as Al Sobrante , is an American musician , best known as the former drummer for the punk rock band Green Day .. Green Day. Green Day. punk rock. punk rock. His name of Al Sobrante is a reference to his hometown , El Sobrante .. El Sobrante. El Sobrante, California. His work with Green Day resulted in about 961,000 albums sold , which are mostly from the compilation album 1,039  /  Smoothed Out Slappy Hours .. Green Day. Green Day
related.