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': 'All are true about gastrinomas except: \nSelect and explain. \nA. Most gastrinomas (50-70%) are present in the duodenum, B. About 10 % of gastrinomas are malignant, C. Metastatic spread to lymph nodes and liver, D. Causes peptic ulcer disease with diarrhea', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Most gastrinomas (50-70%) are present in the duodenum, about 60-90% of gastrinomas are malignant with metastatic spread to lymph nodes and liver. Distant metastases to bone occur in 12-30% of patients with liver metastases. Reference: Harrisons Principles of Internal Medicine, 18th Edition, Page 3065', 'role': 'assistant'}]