With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Music journalism refuses to discuss pop music.
text_B: Catherine of Cleves -LRB- 25 May 1417 -- 10 February 1479 -RRB- was Duchess of Guelders by marriage to Arnold , Duke of Guelders .. Cleves. Cleves. Guelders. Guelders. She acted as regent of Guelders during the absence of her spouse in 1450 .. Guelders. Guelders. The Hours of Catherine of Cleves was commissioned for her .. Cleves. Cleves. Hours of Catherine of Cleves. Hours of Catherine of Cleves
not_related.