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
Which one of the following drugs has been shown to offer protection from gastric aspiration syndrome in a patient with symptoms of efflux - 
Select and explain. 
A. Ondansetron, B. Metoclopramide, C. Sodium citrate, D. Atropine
B: Metoclopramide
Answer: B: Metoclopramide 
Explanation: Ans. is 'b' i.e., Metoclopramide Metoclopramide offers protection from gastric aspiration syndrome in patients with reflux by enhancing the tone of LES and speeding gastric emptying.