In Response to Cutting Up an Onion, Airborne Irritants Released

Multiple Choice

In response to cutting up an onion, airborne irritants released by the onion will cause your eyes to automatically water or produce tears. Using Pavlov's terminology, the tears would be termed a(n) :

A) unconditioned stimulus (UCS) .
B) unconditioned response (UCR) .
C) conditioned stimulus (CS) .
D) conditioned response (CR) .