The correct answer is:  [A]:  " l-dopa" .
{since "l-dopa" is not known to help much with depression — even for "off-label uses" .
The rest of answer choices: 
 [B]: "SSRI's" — selective serotonin reuptake inhibitors — are FDA-approved for the treatment of depressive disorders; as are:
 [C]: "MAOI's" — monoamine oxidase inhibitors; as well as:
 [D]: "HCA's" — heterocyclic antidepressants (e.g. bupropion). 
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