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': 'Drug of choice for Zollinger-Ellison syndrome ? \nSelect and explain. \nA. Antihistaminics, B. Proton pump inhibitors, C. Dopamine agonists, D. Antacids', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. is \'b\' i.e., Proton pump inhibitors "Proton pump inhibitors are the drug of choice for Zollinger Ellison syndrome; they have decreased the need for total gastrectomy".', 'role': 'assistant'}]