This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Oncology, Subject name: Medicine
[{'content': 'All are true about Zollinger Ellison syndrome except - \nSelect and explain. \nA. Surgery is done, B. Exocrine tumour, C. Endocrine disorder, D. Secretory diarrhoea', 'role': 'user'}, {'content': "Answer: B \nExplanation: Zollinger Ellison syndrome is a rare disorder characterised by the triad of severe peptic ulceration, gastric acid hypersecretion and a neuro-endocrine tumour (p. 678) of the pancreas or duodenum ('gastrinoma'). It probably accounts for about 0.1% of all cases of duodenal ulceration. The syndrome occurs in either sex at any age, although it is most common between 30 and 50 years of age Ref Harrison 20th edition pg 667", 'role': 'assistant'}]