With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Christopher Marlowe is a novelist.
text_B: QuietRock is a brand of internally damped drywall panels by PABCO Gypsum which acquired the line from Serious Materials , an American manufacturer of building materials started by Kevin Surace .. damped. damping. drywall. drywall. Kevin Surace. Kevin Surace. It is designed to provide high levels of sound transmission loss between rooms .. the first product was introduced in 2003 .
not_related.