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: Surgery
Which is not true regarding Insulinoma - 
Select and explain. 
A. Hypoglycemic attacks, B. Weight loss, C. Usually Solitary tumour, D. Mostly benign tumour
B: Weight loss
Answer: B: Weight loss 
Explanation: Hypoglycemic attacks are part of Whipple's triad
Insulinoma is usually solitary (~90%)
Only 5 to 15% are malignant