<prompt> A 40-year-old woman develops light-headed episodes associated with sweating, palpitations, and hunger whenever she misses a meal. Her physical examination is normal, and she is not taking any medications. On one such episode, while in hospital, her blood glucose level was 30 mgdL and the symptoms resolved with giving her juice. Which of the following is the most likely diagnosis?excess growth hormoneCushings diseasethyrotoxicosistumor of the pancreatic beta-cells  <response>: Classification of hypoglycemia includes spontaneous causes such as reactive or fasting hypoglycemia and pharmacologic or toxic causes. The diagnosis of insulinoma is most certain when Whipples triad is fulfilled: symptoms consistent with hypoglycemia, low plasma glucose, and relief of symptoms with elevation of plasma glucose to normal. 