Dermatologists are trained to distinguish
an irritation, which results from prolonged exposure to the offending substance, from a true allergic reaction, which manifests itself immediately upon contact with the allergen.
A. an irritation, which results from prolonged exposure to the offending substance, from a true allergic reaction, which manifests itself immediately upon contact with the allergen
B. an irritation, resulting from prolonged exposure to the offending substance, and a true allergic reaction, manifesting itself immediately upon contact with the allergen
C. between an irritation, which results from prolonged exposure to the offending substance, or a true allergic reaction, which manifests itself immediately upon contact with the allergen
D. between an irritation, resulting from prolonged exposure to the offending substance, from a true allergic reaction, manifesting itself immediately upon contact with the allergen
E. a true allergic reaction, which manifests itself immediately upon contact with the allergen, and an irritation, which results from prolonged exposure to the offending substance