A 20-year-old woman is brought to the emergency department due to intractable vomiting and abdominal pain. She has a several-week history of anorexia and weight loss. The patient has well-controlled primary hypothyroidism treated with levothyroxine but has not taken her medication for 2 days because of vomiting. Temperature is 37.6 C (99.7 F), blood pressure is 80/40 mm Hg, pulse is 120/min, and respirations are 18/min. On physical examination, she is mildly lethargic but oriented. Generalized hyperpigmentation is present and is most conspicuous over the face, neck, and dorsal surface of the hands. Urinalysis and chest x-ray are within normal limits. Finger-stick blood glucose is 60 mg/dL. A 1-L bolus of normal saline is rapidly infused, and high-flow intravenous fluids are continued. This patient also requires immediate treatment with which of the following medications?
A. Ceftriaxone
B. Dexamethasone
C. Dopamine
D. Epinephrine
E. Levothyroxine
Ans: B. Dexamethasone