This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Pathology
Insulinoma is the most common functioning tumor of- 
Select and explain. 
A. Pancreas, B. Liver, C. Gallbladder, D. Thyroid
A: Pancreas
Answer: A: Pancreas 
Explanation: Beta-cell tumours or insulinomas are the most common of pancreatic endocrine neoplasms . It may produce sufficient insulin to induce clinically significant hypoglycemia. Clinical picture is dominated by hypoglycemic episodes.,which occurs if blood glucose level falls below 50 mg /DL of serum. Clinical manifestations are confusion,stupor and loss of consciousness. (Ref:ROBBINS Textbook of pathology) ref img