The weight-loss medication currently approved by the FDA for weight loss from the options listed is a lipase inhibitor. Specifically, orlistat is a commonly known lipase inhibitor that aids in weight loss by preventing the absorption of dietary fats.
Hydroxycut is a supplement with no FDA approval for safety or efficacy for weight loss, amphetamines are controlled substances primarily used for ADHD and narcolepsy (though some may be prescribed off-label for weight loss), and Wellbutrin (bupropion) is an antidepressant that may have weight loss as a side effect but is not primarily approved for weight loss.