Grass pollen causes some people to sneeze because of the effect of the allergen on the immune system, which treats it as a foreign invader. In this example, what is the proximal stimulus?
A) the grass pollen
B) the allergen
C) the immune system's response to the allergen
D) the particular season of the year

Question

Quizplus · Accepted Answer

The proximal stimulus is the allergen, which is the substance that directly triggers the immune system's response.

Grass Pollen Causes Some People to Sneeze Because of the Effect