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: Pathology
[{'content': 'Most common site for gastrinoma - \nSelect and explain. \nA. Duodenum, B. Pylorus, C. Antrum, D. Colon', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., DuodenumUpto 50% gastrinoma are found in duodenum.", 'role': 'assistant'}]