This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Central Nervous system, Subject name: Pharmacology
[{'content': 'Drug of choice in intractable hiccups is: \nSelect and explain. \nA. Metoclopramide, B. Fluoxetine, C. Selegiline, D. Chlorpromazine', 'role': 'user'}, {'content': 'Answer: D \nExplanation: CPZ can control intractable hiccup though the mechanism of action is not known. All the other given drugs donot have this action. Ref KD Tripati 8th ed.', 'role': 'assistant'}]