<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A previously healthy 41-year-old woman comes to the physician for the evaluation of recurrent episodes of palpitations and sweating over the past month. Her symptoms typically start after swimming practice and improve after drinking ice tea and eating some candy. She has also had a 5-kg 11-lb weight gain over the past 3 months. She works as a nurse. Physical examination shows no abnormalities. Fasting serum studies show:Glucose 38 mgdLInsulin 260 μUmL N11240Proinsulin 65 μUmL N 20 of total insulinC-peptide 5.0 ngmL N0.83.1Insulin secretagogues absentWhich of the following is the most likely cause of her symptoms?? A: Exogenous administration of insulin, B: Binge eating disorder, C: Pancreatic β-cell tumor, D: Factitious use of sulfonylureas, E: Peripheral resistance to insulin,  <response>: This is a clinical case about a 41-year-old woman with recurrent episodes of palpitations, sweating, weight gain, and hypoglycemia. The key findings are:- Symptoms improve after eating sweets and drinking iced tea, suggesting reactive hypoglycemia- Fasting hypoglycemia with inappropriately elevated insulin, proinsulin, and C-peptide levels- Absence of insulin secretagogues - 5 kg weight gain over 3 monthsThe elevated insulin levels despite hypoglycemia indicate autonomous insulin secretion. The high proinsulin and C-peptide levels confirm endogenous hyperinsulinism rather than exogenous insulin use. The absence of sulfonylureas makes factitious hypoglycemia unlikely. Therefore, the most likely diagnosis is a pancreatic beta cell tumor causing autonomous insulin secretion and hypoglycemia.C: Pancreatic β-cell tumor 