Tianeptine acts by -: (A) MAO inhibitor, (B) Serotonin uptake inhibitor, (C) Serotonin uptake enhancer, (D) 5-HT agonist
Answer is C. Mechanism of action of important atypical antipsychotics 

Tianeptine & amineptine   → Serotonin uptake enhancer
Trazodone                           → α-blocking & weak 5-HT antagonistic action.
Venalafaxine & Duloxetine → serotonin and noradrenaline reuptake inhibitor (SNRI).