This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
[{'content': 'Coicosteroid of choice in Acute Adrenal Insufficiency is: \nSelect and explain. \nA. Fludrocoisone, B. Hydrocoisone, C. Dexamethasone, D. Prednisolone', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Hydrocoisone', 'role': 'assistant'}]