This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
Mechanism of action of tianeptin in the brain is: 
Select and explain. 
A. Selective serotonin reuptake inhibition, B. Selective serotonin reuptake enhancement, C. Selective dopamine reuptake inhibition, D. Selective norepinephrine reuptake inhibition
B: Selective serotonin reuptake enhancement
Answer: B: Selective serotonin reuptake enhancement 
Explanation: None