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': 'For which one of the following tumours Gastrin is a biochemical marker - \nSelect and explain. \nA. Medullary carcinoma of thyroid, B. Pancreatic neuroendocrine tumour, C. Pheochromocytoma, D. Gastrointestinal stromal tumor', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Pancreatic neuroendocrine tumour o Gastrin is secreted by Gastrinomas. o Gastrinomas are neuroendocrine tumors found in Duodenum (50 to 70%) Pancreas (20 to 40%) and Other intraabdominal sites (mesentry, lymphnodes, biliary tract, liver, stomach, ovary).", 'role': 'assistant'}]