Unknown For which one of the following tumors Gastrin is a biochemical marker : A Medullary carcinoma of thyroid B Pancreatic neuroendocrine tumour C Pheochromocytoma D Gastrointestinal stromal tumor 💡 Explanation For which one of the following tumors Gastrin is a biochemical marker : ✓ Correct Answer: B. Pancreatic neuroendocrine tumour