Prozac is primarily used to treat which condition?

Prozac, the brand name for fluoxetine, is primarily known for its efficacy in treating depression, specifically major depressive disorder. As a selective serotonin reuptake inhibitor (SSRI), Prozac works by increasing levels of serotonin in the brain, which can help improve mood, enhance feelings of well-being, and alleviate symptoms associated with depression.

While Prozac may also be prescribed for other mental health conditions and may have some off-label uses, its primary approval is for the treatment of depression. This is why option B is the correct answer. The other conditions mentioned have different primary treatments and medications associated with them, such as anxiety disorders typically being treated with different classes of medications, cholesterol being managed with statins or other lipid-lowering agents, and insomnia often treated with sedatives or specific sleep aids.