With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Daddy Yankee is a performer.
text_B: Barbara Ann Hanawalt -LRB- born 4 March 1941 -RRB- is an American historian and bestselling author .. She specializes in English medieval social history .. English medieval social history. England in the Middle Ages
not_related.