With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Sleep can be disrupted by sleep apnea.
text_B: Diego Alfredo Soto Riffo -LRB- born 22 October 1998 -RRB- is a Chilean professional footballer who plays as a left back for Universidad de Concepcion .. Universidad de Concepcion. C.D. Universidad de Concepcion. footballer. association football. left back. Defender ( association football )
not_related.