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
[{'content': 'Which drug is the most useful in treating an episode of antipsychotic induced acute dystonia ? \nSelect and explain. \nA. Lorazepam, B. Haloperidol, C. Promethazine, D. Phenobarbitone', 'role': 'user'}, {'content': "Answer: C \nExplanation: 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.", 'role': 'assistant'}]