Every night, Pricilla increases her dose of pain medication, noting that the initial dose no longer works. Pricilla seems to have developed:

a. drug tolerance.
b. classical conditioning.
c. withdrawal.
d. psychological dependence.

A

Explanation:

The initial dose is not enough to reach above her baseline.

The baseline in this instance is how much medication she needs to not feel pain; the higher above the baseline the less pain she will feel.

I hope that made sence.