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: None', 'role': 'assistant'}]