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
Drug of choice in intractable hiccups is : 
Select and explain. 
A. Metoclopramide, B. Fluoxetine, C. Selegiline, D. Chlorpromazine
D: Chlorpromazine
Answer: D: Chlorpromazine 
Explanation: None