With no explanation, label text_A→text_B with either "not-entailed" or "entailed".
text_A: At a meeting Friday in Vienna of the International Atomic Energy Agency 's 35-member board , Britain called for Iran to allow the five main nuclear powers to examine what some experts say are designs for making the explosive core of a nuclear warhead .
text_B: Britain is a geographical/political entity
not-entailed.