Prozac is a brand name for the drug fluoxetine. It is commonly used to treat depression, panic disorder, and other mental health conditions. The drug belongs to a class of medications called selective serotonin reuptake inhibitors (SSRIs), which work by increasing the levels of serotonin in the brain. Prozac is known to help improve mood, reduce anxiety, and alleviate symptoms of depression. Therefore, Prozac is the correct answer as it is the brand name for the drug fluoxetine.