Question

which of the following conditions is a bacterial upper respiratory infection characterized by the formation of a thick membranous film across the throat?
a diphtheria
b pertussis
c croup
d asthma

Explanation:

Diphtheria is a bacterial upper - respiratory infection where a thick, grayish - white membranous film forms across the throat. Pertussis is whooping cough and not characterized by this membrane. Croup is a viral or bacterial condition mainly causing a barking cough and airway swelling, not a thick membrane. Asthma is a chronic inflammatory disease of the airways, not an upper - respiratory infection with a membranous film.

Answer:

A. diphtheria