This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Stomach, Subject name: Medicine
[{'content': 'Drug of choice in Zollinger Ellison syndrome is : \nSelect and explain. \nA. Ranitidine, B. Omeprazole, C. Antacids, D. B-blocker', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' Omeprazole (Ref. Harrison, 17/e, p 1869 & 16/e, p 1759 (15/e, p 1662)). Treatment of choice for Zollinger Ellison syndrome is - Proton pump inhibitors (Omeprazole or lansoprazole).", 'role': 'assistant'}]