This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Psychiatry
Which of the following drug is not used in the treatment of akathisia? 
Select and explain. 
A. Benzodiazepam, B. Propranolol, C. Trihexyphenidyl, D. Haloperidol
D: Haloperidol
Answer: D: Haloperidol 
Explanation: Akathisia refers to somatic restlessness which occur in patients treated with first generation antipsychotics. Among the options given haloperidol is an old generation antipsychotic which causes a side effect of akathisia. Drugs commonly used to treat akathisia are propranolol, benzodiazepines and anticholinergics. REF : Oxford text book of psychiatry 3rd Ed.