This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Central Nervous system, Subject name: Pharmacology
Which of the following is not a serotonin-norepine-phrine reuptake inhibitor? 
Select and explain. 
A. Venlafaxine, B. Duloxetine, C. Milnacipran, D. Tianeptin
D: Tianeptin
Answer: D: Tianeptin 
Explanation: Tianeptin is an atypical anti depressant. All others are SNRI. Ref KD Tripati 8th ed.