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
Drug of choice in intractable hiccups is: 
Select and explain. 
A. Metoclopramide, B. Fluoxetine, C. Selegiline, D. Chlorpromazine
D: Chlorpromazine
Answer: D: Chlorpromazine 
Explanation: 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.