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: Medicine
[{'content': 'Zollinger Ellison syndrome is characterized by all of the following except - \nSelect and explain. \nA. Post bulbar ulcer, B. Recurrent duodenal ulcer, C. Severe diarrhoea, D. Massive HCL in response to histamine injection', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]