This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gastrointestinal tract, Subject name: Pharmacology
[{'content': 'Drug given for metaclopramidr induced dystonic reaction is: \nSelect and explain. \nA. Pheniramine, B. Promethazine, C. Chlorpropamide, D. Prochlorperazine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Acute muscle dystonia caused by antiemetic-antipsycotic drugs is promptly relieved by parentral promethazine or hydroxyzine.this is based on central anti cholinergic action of the drugs. Promethazine is an first generation anti histaminic which has maximum anticholinergic activity.(ref: KDT 6/ep157)', 'role': 'assistant'}]