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
[{'content': 'Which one of the following drugs has been shown to offer protection from gastric aspiration syndrome in a patient with symptoms of reflex? \nSelect and explain. \nA. Ondansetron, B. Metoclopramide, C. Sodium citrate, D. Atropine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]