When the number of enzymes needed to break down a drug in the liver increases, it is called:

A) cellular tolerance.
B) metabolic tolerance.
C) sensitization.
D) habituation.

Metabolic Tolerance

A situation where repeated exposure to a substance diminishes the effect of that substance by accelerating the body's metabolism, requiring higher doses for the same effect.

Cellular Tolerance

A condition in which cells reduce their responsiveness to a substance after repeated exposure.