A 32-year-old female with known Addison's disease presents to the emergency department with severe hypotension, nausea, vomiting, and abdominal pain. She is lethargic. What is the most critical initial medication to administer?

✓ Correct Answer: Option B

For acute adrenal crisis, immediate administration of stress-dose intravenous hydrocortisone is paramount to replace glucocorticoids and mineralocorticoids. Fluid resuscitation with normal saline is also critical but corticosteroids directly address the underlying deficiency.