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
All of the following statements about Insulinoma are true Except: 
Select and explain. 
A. Most commonly found in 'Pancreas', B. Usually Benign, C. Usually multiple, D. Derived from Beta cells
C: Usually multiple
Answer: C: Usually multiple 
Explanation: Answer is C (Usually multiple) Insulinomas are usually single and not multiple (>90%) - Harrison's Insulinomas are endocrine tumors of pancreas derived from Beta cells. They are generally small (>90% < 2 cm), usually not multiple (90%) and only 5-15% are malignant (usually benign). Symptoms due to Hypoglycemia Most common symptoms are due to the effect of hypoglycemia on the central nervous system (Neuroglycemic Symptoms) Confusion Headache Disorientation Visual difficulties Irrational behavior (even coma) Symptoms due to Excessive Catecholamine Release secondary to Hypoglycemia Tremor Palpitation