This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pancreas, Subject name: Surgery
[{'content': 'Which of the following tests is not used in the diagnosis of insulinoma? \nSelect and explain. \nA. Fasting blood glucose, B. Xylose test, C. C-peptide levels, D. Insulin/Glucose Ratio', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. (b) Xylose testRef: Blumgart 5th edn- Page 936Tests for Insulinoma:* 72 hours Fasting Blood sugar and Insulin level (Gold Standard to diagnose)* Insulin: Glucose ratio >0.4 is consistent with insulinoma* Elevated Insulin Level (>5-10microunits/ml)* Increased Serum Pro insulin* Elevated C - Peptide levels* Absent Urinary or Plasma Sulfonyl urea's (to look for Drug induced hypoglycemic episodes)* IOC to localise preoperatively - Selective Venous Sampling after arterial Calcium infusion.* IOC to localise Intraoperatively - Intra OP USG", 'role': 'assistant'}]