In treating depression,a psychiatrist would probably prescribe a drug that would

A) increase levels of acetylcholine.
B) decrease levels of dopamine.
C) increase levels of norepinephrine.
D) decrease levels of serotonin.

Increasing levels of norepinephrine is a common strategy for treating depression. Norepinephrine is a neurotransmitter that is involved in regulating mood, among other things, and drugs that increase its levels can help alleviate depressive symptoms. Examples of such drugs include selective serotonin-norepinephrine reuptake inhibitors (SNRIs) and tricyclic antidepressants (TCAs). The other choices are not typically used for treating depression.