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
what is the drug of choice for management of dystonia 
Select and explain. 
A. trihexyphenidyl, B. propanolol, C. vitamin E, D. clonazepam
A: trihexyphenidyl
Answer: A: trihexyphenidyl 
Explanation: Acute dystonia * <48 hours of staing antipsychotics * M.C in======Younger black males * If a patient develops dystonia he is more prone for eps Patient considers this as an Allergic reaction , thereby may stop drugs Layryngeal dystonia is a Psychiatric emergency, should be treated with IV lorazepam TREATMENT * Diphenhydramine * Benztropine mesylate * Prophylactic anticholinergics helps Ref. kaplon and sadock, synopsis of psychiatry, 11 th edition, pg no. 925