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
All drugs are used in Treatment of Mania except - 
Select and explain. 
A. Haloperidol, B. Trihexylphenidyl, C. Lithium, D. Carbamazepine
B: Trihexylphenidyl
Answer: B: Trihexylphenidyl 
Explanation: Drugs used for mania are Lithium, Valproate, Carbamazepine / Oxcarbazepine, Typical & atypical antipsychotics (olanzapine, risperidone, quetiapine, ziprasidone, aripiprazole, haloperidol), benzodiazepines.
Trihexylphenidyl is a central anticholinergic drug used in Drug induced Parkinsonism.