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 an unrelated viral illness that produces similar but milder respiratory symptoms.
text_B: Before diphtheria vaccinations were common, would it be easy to tell if a child was suffering from laryngeal diphtheria rather than croup?
NO.