With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Queen Victoria's son belonged to a Russian dynasty.
text_B: Yago Fernandez Prieto -LRB- born 5 January 1988 -RRB- , known simply as Yago , is a Portuguese professional footballer who plays as a central defender .. footballer. Association football. central defender. Defender ( association football )#Centre-back
not_related.