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
Non-selective serotonin and nor-adrenaline reuptake inhibitor is: 
Select and explain. 
A. Sertraline, B. Citalopram, C. Venlafaxine, D. Paroxetine
C: Venlafaxine
Answer: C: Venlafaxine 
Explanation: None