This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pharmacotherapy in psychiatry, Subject name: Anatomy
mood stabilizer used in the tretament of rapid cycling 
Select and explain. 
A. vaproate, B. lithium, C. carbamezepine, D. lamotrigine
A: vaproate
Answer: A: vaproate 
Explanation: Lamotrigine is a mood stabilizer which works best in BIPOLAR DEPRESSION Lithium is a mood stabilizer which works best in BIPOLAR MANIA valproate is a mood stabilizer which works best in RAPID CYCLING ref. kaplon and sadock, synopsis of psychiatry, 11 thedition, pg no.935