<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 25-year-old woman presents to the emergency department with palpitations, sweating, and blurry vision after playing volleyball on the beach. She denies chest pain and shortness of breath. She states that these episodes occur often, but resolve after eating a meal or drinking a sugary soda. Past medical history is unremarkable, and she takes no medications. Temperature is 37C 98.6F, blood pressure is 13580 mm Hg, pulse is 102min, and respirations are 18min. Fingerstick blood glucose level is 42 gdL. ECG reveals sinus tachycardia. Urinalysis and toxicology are noncontributory. Appropriate medical therapy is administered and she is discharged with an appointment for a fasting blood draw within the week. Laboratory results are as follows:Blood glucose 45 mgdLSerum insulin 20 microUL N: 6 microULSerum proinsulin 10 microUL N: 20 of total insulinC-peptide level 0.8 nmolL N: 0.2 nmolLSulfonylurea NegativeIGF-2 NegativeWhat is the most likely cause of this patients hypoglycemia?? A: Heat stroke, B: Delta cell tumor of the pancreas, C: Exogenous insulin, D: Beta cell tumor of the pancreas, E: Alpha cell tumor of the pancreas,  <response>: Based on the information provided in the question stem, this is a case of a 25-year-old woman with recurrent episodes of hypoglycemia characterized by palpitations, sweating, and blurry vision that resolve after eating. She has no significant medical history. Lab results show low blood glucose, elevated insulin, proinsulin, and C-peptide levels. Sulfonylurea screen is negative. The elevated insulin, proinsulin, and C-peptide levels indicate endogenous hyperinsulinism rather than exogenous insulin use. The recurrent nature of the hypoglycemic episodes and lab findings are most consistent with an insulin-secreting tumor of the pancreas. Heat stroke can cause neuroglycopenic symptoms but would not explain the hypoglycemia. Delta cell and alpha cell tumors secrete somatostatin and glucagon respectively, not insulin. D: Beta cell tumor of the pancreas 