Carla had leukemia as a child and had to undergo numerous bouts of chemotherapy. the chemotherapy always made her nauseous. as she underwent a year of treatment, the waiting room started to make her nauseous. the nausea from the chemotherapy is the:
a. conditioned response.
b. unconditioned stimulus.
c. neutral stimulus.
d. unconditioned response.

Unconditioned response.

Explanation:

Classical conditioning may be defined as the learning procedure when the biological strong stimulus is combined with neutral stimulus elicit a strong response.

In case of Carla the nausea from the chemotherapy acts as unconditioned response. The nausea is unlearned response and occurs due to the regular chemotherapy. The chemotherapy acts as unconditioned stimulus that results in the nausea that acts as unconditioned response.

Thus, the correct answer is option (d).