Final answer:
Bupropion is the antidepressant drug among the listed options that does not inhibit libido, as it has a different mechanism of action which does not typically involve sexual side-effects.
Step-by-step explanation:
The antidepressant drug that does not inhibit libido among the options provided is C. Bupropion. Unlike selective serotonin reuptake inhibitors (SSRIs) such as fluoxetine (Prozac) and sertraline (Zoloft), which may affect sexual function due to increased serotonin levels in the central nervous system, Bupropion is known to have a lower incidence of sexual side-effects. Bupropion works by variably inhibiting the reuptake of norepinephrine and dopamine, contributing to its different side effect profile compared to SSRIs and tricyclic antidepressants.