With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Fear of social situations characterizes social anxiety disorder.
text_B: Soulcrusher is the debut album by American hard rock band Operator .. Operator. Operator ( band ). Soulcrusher. Soulcrusher ( song ). hard rock. hard rock. The album sold over 110,000 copies and peaked at # 14 on the Billboard Heatseekers chart .
not_related.