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: Psychiatry
Drug of choice for prophylaxis of Mania is 
Select and explain. 
A. Diazepam, B. Lithium, C. Haloperidol, D. Fluoxetin
B: Lithium
Answer: B: Lithium 
Explanation: B i.e. Lithium Condition Drug of choice Acute mania Prophylaxis of bipolar disorder Lithium (Li)Q LiQ Rapid cyclers ValproateQ or Li & L-T3 > Carbamazepine