Question

which of the following is a term meaning a substance that causes an allergic reaction?
a allogen
b allergen
c allergy
d allergist

Explanation:

An allergen is a substance that causes an allergic reaction. "Allogen" is not the correct term. "Allergy" refers to the condition of having an allergic reaction. An "allergist" is a medical - professional who treats allergies.

Answer:

B. allergen