With no explanation, label text_A→text_B with either "not-entailed" or "entailed".
text_A: Of these , WHO experts say 25,000 to 30,000 individuals are infected with extremely drug-resistant TB , or XDR TB , which is resistant not only to two or more standard antibiotics , but three or more of a newer class of antibiotics .
text_B: XDR TB is a natural entity
entailed.