With no explanation, label text_A→text_B with either "not-entailed" or "entailed".
text_A: The leader of Sri Lanka 's Tamil Tigers has issued an ultimatum to the government , warning his group will intensify the struggle for self-determination in 2006 if Colombo does not offer what he called a reasonable political settlement .
text_B: Tamil Tigers is a geographical/political entity
not-entailed.