With no explanation, label text_A→text_B with either "DON'T KNOW", "NO" or "YES".
text_A: Laryngeal diphtheria can lead to a characteristic swollen neck and throat, or "bull neck". The swollen throat is often accompanied by a serious respiratory condition, characterized by a brassy or "barking" cough, stridor, hoarseness, and difficulty breathing; and historically referred to variously as "diphtheritic croup", "true croup", or sometimes simply as "croup". Diphtheritic croup is extremely rare in countries where diphtheria vaccination is customary. As a result, the term "croup" nowadays most often refers to a viral illness that produces unrelated and milder respiratory symptoms.
text_B: If virus particles of laryngeal diphtheria and the illness commonly called croup were studied under a microscope, would they probably be easy to differentiate?
DON'T KNOW.