With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: KFC opened a restaurant abroad by the mid-1960s.
text_B: Federico Ubaldo della Rovere -LRB- 16 May 1605 -- 28 June 1623 -RRB- was Duke of Urbino and the father of Vittoria della Rovere .. Duke of Urbino. Duke of Urbino. Urbino. Duchy of Urbino. Vittoria della Rovere. Vittoria della Rovere
not_related.