<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 21-year-old woman is admitted to the hospital for severe malnutrition with a BMI of 15 kgm2. Past medical history is significant for chronic anorexia nervosa. During the course of her stay, she is treated with parenteral fluids and nutrition management. On the 4th day, her status changes. Her blood pressure is 11075 mm Hg, heart rate is 120min, respiratory rate is 25min, and temperature is 37.0C 98.6F. On physical exam, her heart is tachycardic with a regular rhythm and her lungs are clear to auscultation bilaterally. She appears confused, disoriented, and agitated. Strength in her lower extremities is 45. What is the next step in management?? A: MRI of the brain, B: Arrange for outpatient counseling, C: Measure electrolytes, D: Administer insulin, E: Doppler ultrasound on lower extremities,  <response>: This is a medical question about a malnourished patient with anorexia nervosa who develops new symptoms including tachycardia, confusion, disorientation, agitation, and weakness while hospitalized. The key findings are malnutrition, new onset mental status changes, and muscle weakness which raise concern for refeeding syndrome. Refeeding syndrome can occur when nutrition is reintroduced too rapidly in a malnourished patient, leading to electrolyte abnormalities like hypophosphatemia that can cause the neurologic and muscular symptoms described. The next step would be to check electrolytes like phosphate to evaluate for refeeding syndrome. MRI of the brain, counseling, insulin, and Doppler ultrasound do not directly evaluate for refeeding syndrome.C: Measure electrolytes 