With no explanation, label text_A→text_B with either "not-entailed" or "entailed".
text_A: `` The Berlin daily Der Tagesspiegel this week , `` continued UPI , `` quoted ' NATO intelligence sources ' who claimed that the NATO allies had been informed that the United States is currently investigating all possibilities of bringing the mullah - led regime into line , including military options .
text_B: The investigating did not happen
not-entailed.