Sometimes two or more drugs are so similar in their actions on the brain and the body that as people build a tolerance for one drug, they are simultaneously developing a tolerance for the other. This is known as:

A) synergism.
B) polysubstance disorder.
C) cross-tolerance.
D) comorbidity.

Cross-tolerance

A phenomenon where tolerance to the effects of a certain drug produces tolerance to another drug, usually because both drugs are similar in their effects or mechanisms of action.

Polysubstance Disorder

A condition characterized by the misuse of multiple substances or drugs, either simultaneously or at different times.

Tolerance

The process by which the body increasingly adapts to a substance (like alcohol or drugs), requiring larger amounts to achieve the original effect.