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
Which of the following is not a mood stabilizer ? 
Select and explain. 
A. Lithium, B. Valproate, C. Carbamazepine, D. Fluoxetine
D: Fluoxetine
Answer: D: Fluoxetine 
Explanation: None