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: Pharmacology
Which drug is the most useful in treating an episode of antipsychotic induced acute dystonia ? 
Select and explain. 
A. Lorazepam, B. Haloperidol, C. Promethazine, D. Phenobarbitone
C: Promethazine
Answer: C: Promethazine 
Explanation: Ans. is 'c' i.e., Promethazine o Antihistaminics have central anticholinergic propey (e.g. promethazine) and central anticholinergic is the drug of choice for acute dystonia.